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Friday, January 12, 2024

Class conflict

From Wikipedia, the free encyclopedia

In political science, the term class conflict (also class struggle, class warfare, capital-labour conflict) refers to the political tension and economic antagonism that exist among the social classes of society, because of socioeconomic competition for resources among the social classes, between the rich and the poor. In the political and economic philosophies of Karl Marx and Mikhail Bakunin, class struggle is a central tenet and a practical means for effecting radical sociopolitical changes for the social majority, the working class.

The forms of class conflict include direct violence, such as wars, for access to and control of natural resources and labour; assassinations and revolution; indirect violence, such as death from poverty and starvation, illness and unsafe working conditions; economic coercion, such as the threat of unemployment and capital flight, the withdrawal of investment capital; and ideologically, by way of political literature.

The political forms of class warfare include lobbying (legal and illegal) and bribery of legislators. The social-class conflict can be direct, as in a dispute between labour and management such as an employer's industrial lockout of their employees in effort to weaken the bargaining power of the corresponding trade union; or indirect such as a workers' slowdown of production in protest against unfair labor practices, low wages, and poor working conditions.

Usage

Truck drivers fight the police in the course of the Minneapolis Teamsters Strike of 1934
Heads of aristocrats on pikes at the storming of the Bastille
Farmer confronting landlord during China's Land Reform Movement

In political science, socialists and Marxists use the term class conflict to define a social class by its relationship to the means of production, such as factories, agricultural land, and industrial machinery. The social control of labor and of the production of goods and services is a political contest between the social classes.

The anarchist Mikhail Bakunin said that the class struggles of the working class, the peasantry, and the working poor were central to realizing a social revolution to depose and replace the ruling class, and the creation of libertarian socialism.

Marx's theory of history proposes that class conflict is decisive in the history of economic systems organized by hierarchies of social class such as capitalism and feudalism. Marxists refer to its overt manifestations as class war, a struggle whose resolution in favor of the working class is viewed by them as inevitable under the plutocratic capitalism.

Oligarchs versus commoners

Where societies are socially divided based on status, wealth, or control of social production and distribution, class structures arise and are thus coeval with civilization itself. This has been well documented since at least European classical antiquity such as the Conflict of the Orders and Spartacus, among others.

Thucydides

In his History, Thucydides describes a civil war in the city of Corcyra between the pro-Athens party of the common people and their pro-Corinth oligarchic opposition. Near the climax of the struggle, "the oligarchs in full rout, fearing that the victorious commons might assault and carry the arsenal and put them to the sword, fired the houses round the market-place and the lodging-houses, in order to bar their advance."

The historian Tacitus would later recount a similar class conflict in the city of Seleucia, in which disharmony between the oligarchs and the commoners would typically lead to each side calling on outside help to defeat the other. Thucydides believed that "as long as poverty gives men the courage of necessity, [...] so long will the impulse never be wanting to drive men into danger."

Aristotle

In the Politics, Aristotle describes the basic dimensions of class war: "Again, because the rich are generally few in number, while the poor are many, they appear to be antagonistic, and as the one or the other prevails they form the government.". Aristotle also commented that "poverty is the parent of revolution", but did not consider poverty to be the only cause of revolution. In a society where property is distributed equally throughout the community, "the nobles will be dissatisfied, because they think themselves worthy of more than an equal share of honors; and this is often found to be a cause of sedition and revolution." Moreover, Aristotle said that it was wrong for the poor to seize the wealth of the rich and divide it among themselves, but he said that it is wrong for the rich to impoverish the multitude.

Moreover, Aristotle further discussed a middle way, between laxity and cruelty, in the treatment of slaves by their masters, averring that "if not kept in hand, [slaves] are insolent, and think that they are as good as their masters, and, if harshly treated, they hate and conspire against them."

Socrates

Socrates was the first Greek philosopher to describe class warfare. In the Republic, by Plato, Socrates said that "any city, however small, is in fact divided into two, one the city of the poor, the other [the city] of the rich; these [cities] are at war with one another." Socrates disapproved of oligarchies, in which members of a small class of wealthy property owners take positions of political power in order to dominate the large social class of impoverished commoners; and used the analogy of a maritime pilot, who, like the power-holder in a polis, ought to be chosen for political office for his skill, not for the amount of property he owns.

Plutarch

This 6th century Athenian black-figure urn, in the British Museum, depicts the olive harvest. Many farmers, enslaved for debt, would have worked on large estates for their creditors.

The historian Plutarch recounts how the Greek people participated in the class warfare between the aristocrats and the common folk. Financially oppressed by their indebtedness to the aristocrats, the mass of Athenians chose Solon to be the lawgiver to lead them to freedom from their creditors. The philosopher Georg Wilhelm Friedrich Hegel said that Solon's constitution of the Athenian popular assembly created a political sphere that balanced the competing socio-economic interests of the social classes of Athens:

  • The wealthy aristocratic party of the plain
  • The poor common party of the mountains
  • The moderate party of the coast

Participating in a war among the social classes of Ancient Greece was a dangerous political endeavour. In the book Parallel Lives, Plutarch reported that King Agis of Sparta said that, "being desirous to raise the people, and to restore the noble and just form of government, now long fallen into disuse, [he] incurred the hatred of the rich and powerful, who could not endure to be deprived of the selfish enjoyment to which they were accustomed."

Patricians versus plebeians

It was similarly difficult for the Romans to maintain peace between the upper class, the patricians, and the lower class, the plebs. French Enlightenment philosopher Montesquieu notes that this conflict intensified after the overthrow of the Roman monarchy. In The Spirit of Laws he lists the four main grievances of the plebs, which were rectified in the years following the deposition of King Tarquin:

  • The patricians had much too easy access to positions of public service.
  • The constitution granted the consuls far too much power.
  • The plebs were constantly verbally slighted.
  • The plebs had too little power in their assemblies.

Camillus

The Senate had the ability to give a magistrate the power of dictatorship, meaning he could bypass public law in the pursuit of a prescribed mandate. Montesquieu explains that the purpose of this institution was to tilt the balance of power in favour of the patricians. However, in an attempt to resolve a conflict between the patricians and the plebs, the dictator Camillus used his power of dictatorship to coerce the Senate into giving the plebs the right to choose one of the two consuls.

Marius

Tacitus believed that the increase in Roman power spurred the patricians to expand their power over more and more cities. This process, he felt, exacerbated pre-existing class tensions with the plebs, and eventually culminated in a civil war between the patrician Sulla and the populist reformer Marius. Marius had taken the step of enlisting capite censi, the very lowest class of citizens, into the army, for the first time allowing non-land owners into the legions.

Tiberius Gracchus

Tiberius Gracchus

Of all the notable figures discussed by Plutarch and Tacitus, agrarian reformer Tiberius Gracchus may have most challenged the upper classes and most championed the cause of the lower classes. In a speech to the common soldiery, he decried their lowly conditions:

"The savage beasts," said he, "in Italy, have their particular dens, they have their places of repose and refuge; but the men who bear arms, and expose their lives for the safety of their country, enjoy in the meantime nothing more in it but the air and light; and having no houses or settlements of their own, are constrained to wander from place to place with their wives and children."

Following this observation, he remarked that these men "fought indeed and were slain, but it was to maintain the luxury and the wealth of other men." Cicero believed that Tiberius Gracchus's reforming efforts saved Rome from tyranny, arguing:

Tiberius Gracchus (says Cicero) caused the free-men to be admitted into the tribes, not by the force of his eloquence, but by a word, by a gesture; which had he not effected, the republic, whose drooping head we are at present scarce able to uphold, would not even exist.

Tiberius Gracchus weakened the power of the Senate by changing the law so that judges were chosen from the ranks of the knights, instead of their social superiors in the senatorial class.

Julius Caesar

Contrary to Shakespeare's depiction of Julius Caesar in the tragedy Julius Caesar, historian Michael Parenti has argued that Caesar was a populist, not a tyrant. In 2003 The New Press published Parenti's The Assassination of Julius Caesar: A People's History of Ancient Rome. Publishers Weekly said "Parenti [...] narrates a provocative history of the late republic in Rome (100–33 BC) to demonstrate that Caesar's death was the culmination of growing class conflict, economic disparity and political corruption." Kirkus Reviews wrote: "Populist historian Parenti... views ancient Rome’s most famous assassination not as a tyrannicide but as a sanguinary scene in the never-ending drama of class warfare."

Coriolanus

Coriolanus, Act V, Scene III. Engraved by James Caldwell from a painting by Gavin Hamilton

The patrician Coriolanus, whose life William Shakespeare would later depict in the tragic play Coriolanus, fought on the other side of the class war, for the patricians and against the plebs. When grain arrived to relieve a serious shortage in the city of Rome, the plebs made it known that they felt it ought to be divided amongst them as a gift, but Coriolanus stood up in the Senate against this idea on the grounds that it would empower the plebs at the expense of the patricians.

This decision would eventually contribute to Coriolanus's undoing when he was impeached following a trial by the tribunes of the plebs. Montesquieu recounts how Coriolanus castigated the tribunes for trying a patrician, when in his mind no one but a consul had that right, although a law had been passed stipulating that all appeals affecting the life of a citizen had to be brought before the plebs.

In the first scene of Shakespeare's Coriolanus, a crowd of angry plebs gathers in Rome to denounce Coriolanus as the "chief enemy to the people" and "a very dog to the commonalty" while the leader of the mob speaks out against the patricians thusly:

They ne'er cared for us yet: suffer us to famish, and their store-houses crammed with grain; make edicts for usury, to support usurers; repeal daily any wholesome act established against the rich, and provide more piercing statutes daily, to chain up and restrain the poor. If the wars eat us not up, they will; and there's all the love they bear us.

Landlessness and debt

The Secession of the People to the Mons Sacer, engraving by B. Barloccini, 1849

Enlightenment-era historian Edward Gibbon might have agreed with this narrative of Roman class conflict. In the third volume of The History of the Decline and Fall of the Roman Empire, he relates the origins of the struggle:

[T]he plebeians of Rome [...] had been oppressed from the earliest times by the weight of debt and usury; and the husbandman, during the term of his military service, was obliged to abandon the cultivation of his farm. The lands of Italy which had been originally divided among the families of free and indigent proprietors, were insensibly purchased or usurped by the avarice of the nobles; and in the age which preceded the fall of the republic, it was computed that only two thousand citizens were possessed of an independent substance.

Hegel similarly states that the 'severity of the patricians their creditors, the debts due to whom they had to discharge by slave-work, drove the plebs to revolts.' Gibbon also explains how Augustus facilitated this class warfare by pacifying the plebs with actual bread and circuses.

The economist Adam Smith noted that the poor freeman's lack of land provided a major impetus for Roman colonisation, as a way to relieve class tensions at home between the rich and the landless poor. Hegel described the same phenomenon happening in the impetus to Greek colonisation.

Masters versus workmen

Writing in pre-capitalist Europe, both the Swiss philosophe Jean-Jacques Rousseau and the Scottish Enlightenment philosopher Adam Smith made significant remarks on the dynamics of class struggle, as did the Federalist statesman James Madison across the Atlantic Ocean. Later, in the age of early industrial capitalism, English political economist John Stuart Mill and German idealist Georg Wilhelm Friedrich Hegel would also contribute their perspectives to the discussion around class conflict between employers and employees.

Rousseau

Rousseau by Maurice Quentin de La Tour, 1753

It was with bitter sarcasm that Rousseau outlined the class conflict prevailing in his day between masters and their workmen:

You have need of me, because I am rich and you are poor. We will therefore come to an agreement. I will permit you to have the honour of serving me, on condition that you bestow on me the little you have left, in return for the pains I shall take to command you.

Rousseau argued that the most important task of any government is to fight in class warfare on the side of workmen against their masters, who he said engage in exploitation under the pretence of serving society. Specifically, he believed that governments should actively intervene in the economy to abolish poverty and prevent the accrual of too much wealth in the hands of too few men.

Adam Smith

Like Rousseau, the classical liberal Adam Smith believed that the amassing of property in the hands of a minority naturally resulted in a disharmonious state of affairs where "the affluence of the few supposes the indigence of many" and "excites the indignation of the poor, who are often both driven by want, and prompted by envy, to invade [the rich man's] possessions."

Concerning wages, he explained the conflicting class interests of masters and workmen, who he said were often compelled to form trade unions for fear of suffering starvation wages, as follows:

What are the common wages of labour, depends everywhere upon the contract usually made between those two parties, whose interests are by no means the same. The workmen desire to get as much, the masters to give as little, as possible. The former are disposed to combine in order to raise, the latter in order to lower, the wages of labour.

Smith was aware of the main advantage of masters over workmen, in addition to state protection:

The masters, being fewer in number, can combine much more easily: and the law, besides, authorises, or at least does not prohibit, their combinations, while it prohibits those of the workmen. We have no acts of parliament against combining to lower the price of work, but many against combining to raise it. In all such disputes, the masters can hold out much longer. A landlord, a farmer, a master manufacturer, or merchant, though they did not employ a single workman, could generally live a year or two upon the stocks, which they have already acquired. Many workmen could not subsist a week, few could subsist a month, and scarce any a year, without employment. In the long run, the workman may be as necessary to his master as his master is to him; but the necessity is not so immediate.

Smith observed that, outside of colonies where land is cheap and labour expensive, both the masters who subsist by profit and the masters who subsist by rents will work in tandem to subjugate the class of workmen, who subsist by wages. Moreover, he warned against blindly legislating in favour of the class of masters who subsist by profit, since, as he said, their intention is to gain as large a share of their respective markets as possible, which naturally results in monopoly prices or close to them, a situation harmful to the other social classes.

James Madison

In his Federalist No. 10, James Madison revealed an emphatic concern with the conflict between rich and poor, commenting that "the most common and durable source of factions has been the various and unequal distribution of property. Those who hold and those who are without property have ever formed distinct interests in society. Those who are creditors, and those who are debtors, fall under a like discrimination." He welcomed class-based factions into political life as a necessary result of political liberty, stating that the most important task of government was to manage and adjust for 'the spirit of party'.

John Stuart Mill

Adam Smith was not the only classical liberal political economist concerned with class conflict. In his Considerations on Representative Government, John Stuart Mill observed the complete marginalisation of workmen's voices in Parliament, rhetorically asking whether its members ever empathise with the position of workmen, instead of siding entirely with their masters, on issues such as the right to go on strike. Later in the book, he argues that an important function of truly representative government is to provide a relatively equal balance of power between workmen and masters, in order to prevent threats to the good of the whole of society.

During Mill's discussion of the merits of progressive taxation in his essay Utilitarianism, he notes as an aside the power of the rich as independent of state support:

People feel obliged to argue that the State does more for the rich than for the poor, as a justification for its taking more [in taxation] from them: though this is in reality not true, for the rich would be far better able to protect themselves, in the absence of law or government, than the poor, and indeed would probably be successful in converting the poor into their slaves.

Hegel

In his Philosophy of Right, Hegel expressed concern that the standard of living of the poor might drop so far as to make it even easier for the rich to amass even more wealth. Hegel believed that, especially in a liberal country such as contemporary England, the poorest will politicise their situation, channelling their frustrations against the rich:

Against nature man can claim no right, but once society is established, poverty immediately takes the form of a wrong done to one class by another.

Capitalist societies

The typical example of class conflict described is class conflict within capitalism. This class conflict is seen to occur primarily between the bourgeoisie and the proletariat, and takes the form of conflict over hours of work, value of wages, division of profits, cost of consumer goods, the culture at work, control over parliament or bureaucracy, and economic inequality. The particular implementation of government programs which may seem purely humanitarian, such as disaster relief, can actually be a form of class conflict.

Thomas Jefferson

Thomas Jefferson (1743–1826) led the U.S. as president from 1801 to 1809 and is considered one of America's Founding Fathers. Regarding the interaction between social classes, he wrote:

I am convinced that those societies (as the Indians) which live without government enjoy in their general mass an infinitely greater degree of happiness than those who live under the European governments. Among the former, public opinion is in the place of law, & restrains morals as powerfully as laws ever did anywhere. Among the latter, under pretence of governing they have divided their nations into two classes, wolves & sheep. I do not exaggerate. This is a true picture of Europe. Cherish therefore the spirit of our people, and keep alive their attention. Do not be too severe upon their errors, but reclaim them by enlightening them. If once they become inattentive to the public affairs, you & I, & Congress & Assemblies, judges & governors shall all become wolves. It seems to be the law of our general nature, in spite of individual exceptions; and experience declares that man is the only animal which devours his own kind, for I can apply no milder term to the governments of Europe, and to the general prey of the rich on the poor.

— Thomas Jefferson, Letter to Edward Carrington – 16 January 1787

Max Weber

Max Weber (1864–1920) agreed with the fundamental ideas of Karl Marx about the economy causing class conflict, but claimed that class conflict can also stem from prestige and power. Weber argued that classes come from the different property locations. Different locations can largely affect one's class by their education and the people they associate with. He also stated that prestige results in different status groupings. This prestige is based upon the social status of one's parents. Prestige is an attributed value and many times cannot be changed. Weber stated that power differences led to the formation of political parties. Weber disagreed with Marx about the formation of classes. While Marx believed that groups are similar due to their economic status, Weber argued that classes are largely formed by social status. Weber did not believe that communities are formed by economic standing, but by similar social prestige. Weber did recognize that there is a relationship between social status, social prestige and classes.

Twentieth century

In the U.S., class conflict is often noted in labor/management disputes. As far back as 1933 representative Edward Hamilton of the Airline Pilot's Association, used the term "class warfare" to describe airline management's opposition at the National Labor Board hearings in October of that year. Apart from these day-to-day forms of class conflict, during periods of crisis or revolution class conflict takes on a violent nature and involves repression, assault, restriction of civil liberties, and murderous violence such as assassinations or death squads.

Twenty-first century

Financial crisis

Class conflict intensified in the period after the 2007/8 financial crisis, which led to a global wave of anti-austerity protests, including the Greek and Spanish Indignados movements and later the Occupy movement, whose slogan was "We are the 99%", signalling a more expansive class antagonist against the financial elite than that of the classical Marxist proletariat.

The investor, billionaire, and philanthropist Warren Buffett, one of the wealthiest people in the world, voiced in 2005 and once more in 2006 his view that his class, the "rich class", is waging class warfare on the rest of society. In 2005 Buffet said to CNN: "It's class warfare, my class is winning, but they shouldn't be." In a November 2006 interview in The New York Times, Buffett stated that "[t]here’s class warfare all right, but it’s my class, the rich class, that’s making war, and we’re winning."

In the speech "The Great American Class War" (2013), the journalist Bill Moyers asserted the existence of social-class conflict between democracy and plutocracy in the U.S. Chris Hedges wrote a column for Truthdig called "Let's Get This Class War Started", which was a play on Pink's song "Let's Get This Party Started." In a 2022 piece "America’s New Class War", Hedges argues that increased class struggle and strikes by organized workers, often in defiance of union leadership, is the "one last hope for the United States."

Historian Steve Fraser, author of The Age of Acquiescence: The Life and Death of American Resistance to Organized Wealth and Power, asserted in 2014 that class conflict is an inevitability if current political and economic conditions continue, noting that "people are increasingly fed up [...] their voices are not being heard. And I think that can only go on for so long without there being more and more outbreaks of what used to be called class struggle, class warfare."

Arab Spring

Often seen as part of the same "movement of squares" as the Indignado and Occupy movements, the Arab Spring was a wave of social protests starting in 2011. Numerous factors have culminated in the Arab Spring, including rejection of dictatorship or absolute monarchy, human rights violations, government corruption (demonstrated by Wikileaks diplomatic cables), economic decline, unemployment, extreme poverty, and a number of demographic structural factors, such as a large percentage of educated but dissatisfied youth within the population. but class conflict is also a key factor. The catalysts for the revolts in all Northern African and Persian Gulf countries have been the concentration of wealth in the hands of autocrats in power for decades, insufficient transparency of its redistribution, corruption, and especially the refusal of the youth to accept the status quo.

Socialism

Marxist perspectives

Karl Marx, 1875

Karl Marx (1818–1883) was a German born philosopher who lived the majority of his adult life in London, England. In The Communist Manifesto, Karl Marx argued that a class is formed due to changes in the mode of production. Members of a class may become aware of their position within it, achieving what is known as class consciousness. For the working classes this happens when their members become aware of their exploitation at the hands of the ruling class. According to Marx, the working class then takes action against the ruling class, and vice versa.

What Marx points out is that members of each of the two main classes have interests in common. These class or collective interests are in conflict with those of the other class as a whole. This in turn leads to conflict between individual members of different classes.

Marxist analysis of society identifies two main social groups:

  • Labour (the proletariat or workers) includes anyone who earns their livelihood by selling their labor power and being paid a wage or salary for their labor time. They have little choice but to work for capital, since they typically have no independent way to survive.
  • Capital (the bourgeoisie or capitalists) includes anyone who gets their income not from labor as much as from the surplus value they appropriate from the workers who create wealth. The income of the capitalists, therefore, is based on their exploitation of the workers (proletariat).

Not all class struggle is violent or necessarily radical, as with strikes and lockouts. Class antagonism may instead be expressed as low worker morale, minor sabotage and pilferage, and individual workers' abuse of petty authority and hoarding of information. It may also be expressed on a larger scale by support for socialist or populist parties. On the employers' side, the use of union busting legal firms and the lobbying for anti-union laws are forms of class struggle.

Not all class struggle is a threat to capitalism, or even to the authority of an individual capitalist. A narrow struggle for higher wages by a small sector of the working-class, what is often called "economism", hardly threatens the status quo. In fact, by applying the craft-union tactics of excluding other workers from skilled trades, an economistic struggle may even weaken the working class as a whole by dividing it. Class struggle becomes more important in the historical process as it becomes more general, as industries are organized rather than crafts, as workers' class consciousness rises, and as they self-organize away from political parties. Marx referred to this as the progress of the proletariat from being a class "in itself", a position in the social structure, to being one "for itself", an active and conscious force that could change the world.

Marx largely focuses on the capital industrialist society as the source of social stratification, which ultimately results in class conflict. He states that capitalism creates a division between classes which can largely be seen in manufacturing factories. The proletariat is separated from the bourgeoisie because production becomes a social enterprise. Contributing to their separation is the technology that is in factories. Technology de-skills and alienates workers as they are no longer viewed as having a specialized skill. Another effect of technology is a homogenous workforce that can be easily replaceable. Marx believed that this class conflict would result in the overthrow of the bourgeoisie and that the private property would be communally owned. The mode of production would remain, but communal ownership would eliminate class conflict.

Even after a revolution, the two classes would struggle, but eventually the struggle would recede and the classes dissolve. As class boundaries broke down, the state apparatus would wither away. According to Marx, the main task of any state apparatus is to uphold the power of the ruling class; but without any classes there would be no need for a state. That would lead to the classless, stateless communist society.

Soviet Union and similar societies

A variety of thinkers, mostly Trotskyist and anarchist, argue that class conflict existed in Soviet-style societies. Their arguments describe as a class the bureaucratic stratum formed by the ruling political party (known as the nomenklatura in the Soviet Union), sometimes termed a "new class", that controls and guides the means of production. This ruling class is viewed to be in opposition to the remainder of society, generally considered the proletariat. This type of system is referred by them as state socialism, state capitalism, bureaucratic collectivism or new class societies. Marxism was already a powerful ideological power in Russia before the Soviet Union was created in 1917, since a Marxist group known as the Russian Social Democratic Labour Party existed. This party soon divided into two main factions; the Bolsheviks, who were led by Vladimir Lenin, and the Mensheviks, who were led by Julius Martov.

However, many Marxists argue that unlike in capitalism, the Soviet elites did not own the means of production, or generated surplus value for their personal wealth like in capitalism as the generated profit from the economy was equally distributed into Soviet society. Even some Trotskyist like Ernest Mandel criticized the concept of a new ruling class as an oxymoron, saying: "The hypothesis of the bureaucracy’s being a new ruling class leads to the conclusion that, for the first time in history, we are confronted with a 'ruling class' which does not exist as a class before it actually rules."

Non-Marxist perspectives

One of the first writers to comment on class struggle in the modern sense of the term was the French revolutionary François Boissel. Other class struggle commentators include Henri de Saint-Simon, Augustin Thierry, François Guizot, François-Auguste Mignet and Adolphe Thiers. The Physiocrats, David Ricardo, and after Marx, Henry George noted the inelastic supply of land and argued that this created certain privileges (economic rent) for landowners. According to the historian Arnold J. Toynbee, stratification along lines of class appears only within civilizations, and furthermore only appears during the process of a civilization's decline while not characterizing the growth phase of a civilization.

Pierre-Joseph Proudhon, in What is Property? (1840) states that "certain classes do not relish investigation into the pretended titles to property, and its fabulous and perhaps scandalous history." While Proudhon saw the solution as the lower classes forming an alternative, solidarity economy centered on cooperatives and self-managed workplaces, which would slowly undermine and replace capitalist class society, the anarchist Mikhail Bakunin, while influenced by Proudhon, insisted that a massive class struggle by the working class, peasantry and poor was essential to the creation of libertarian socialism. This would require a final showdown in the form of a social revolution.

One of the earliest analyses of the development of class as the development of conflicts between emergent classes is available in Peter Kropotkin's Mutual Aid. In this work, Kropotkin analyzes the disposal of goods after death in pre-class or hunter-gatherer societies, and how inheritance produces early class divisions and conflict.

Fascists have often opposed 'horizontal' class struggle in favour of vertical national struggle and instead have attempted to appeal to the working class while promising to preserve the existing social classes and have proposed an alternative concept known as class collaboration.

Noam Chomsky

Noam Chomsky, 2004

Noam Chomsky, American linguist, philosopher, and political activist, has spoken out on the topic of class war in the United States:

Well, there’s always a class war going on. The United States, to an unusual extent, is a business-run society, more so than others. The business classes are very class-conscious – they’re constantly fighting a bitter class war to improve their power and diminish opposition. Occasionally this is recognized... The enormous benefits given to the very wealthy, the privileges for the very wealthy here, are way beyond those of other comparable societies and are part of the ongoing class war. Take a look at CEO salaries....

— Noam Chomsky, Occupy: Class War, Rebellion and Solidarity, Second Edition (November 5, 2013)

Libertarianism

Charles Comte and Charles Dunoyer argued that class struggle came from factions that managed to gain control of the State power. The ruling class are the groups that seize the power of the State to carry out their political agenda, the ruled are then taxed and regulated by the State for the benefit of the Ruling classes. Through taxation, state power, subsidies, Tax codes, laws, and privileges the State creates class conflict by giving preferential treatment to some at the expense of others by force. In the free market, by contrast, exchanges are not carried out by force but by the Non-aggression principle of cooperation in a Win-win scenario.

Relationship to race

Jobless black workers in the heat of the Philadelphia summer, 1973

Some historical tendencies of Orthodox Marxism reject racism, sexism, etc. as struggles that essentially distract from class struggle, the real conflict. These divisions within the class prevent the purported antagonists from acting in their common class interest. However, many Marxist internationalists and anti-colonial revolutionaries believe that sex, race and class are bound up together. Within Marxist scholarship there is an ongoing debate about these topics.

According to Michel Foucault, in the 19th century, the essentialist notion of the "race" was incorporated by racists, biologists, and eugenicists, who gave it the modern sense of "biological race" which was then integrated into "state racism". On the other hand, Foucault claims that when Marxists developed their concept of "class struggle", they were partly inspired by the older, non-biological notions of the "race" and the "race struggle". Quoting a non-existent 1882 letter from Marx to Friedrich Engels during a lecture, Foucault erroneously claimed Marx wrote: "You know very well where we found our idea of class struggle; we found it in the work of the French historians who talked about the race struggle." For Foucault, the theme of social war provides the overriding principle that connects class and race struggle.

Moses Hess, an important theoretician and labor Zionist of the early socialist movement, in his "Epilogue" to "Rome and Jerusalem" argued that "the race struggle is primary, the class struggle secondary. [...] With the cessation of race antagonism, the class struggle will also come to a standstill. The equalization of all classes of society will necessarily follow the emancipation of all the races, for it will ultimately become a scientific question of social economics."

W. E. B. Du Bois theorized that the intersectional paradigms of race, class, and nation might explain certain aspects of black political economy. Patricia Hill Collins writes: "Du Bois saw race, class, and nation not primarily as personal identity categories but as social hierarchies that shaped African-American access to status, poverty, and power."

In modern times, emerging schools of thought in the U.S. and other countries hold the opposite to be true. They argue that the race struggle is less important, because the primary struggle is that of class since labor of all races face the same problems and injustices.

Utopian socialism

From Wikipedia, the free encyclopedia
Phalanstère, a type of building designed by Charles Fourier

Utopian socialism is the term often used to describe the first current of modern socialism and socialist thought as exemplified by the work of Henri de Saint-Simon, Charles Fourier, Étienne Cabet, and Robert Owen. Utopian socialism is often described as the presentation of visions and outlines for imaginary or futuristic ideal societies, with positive ideals being the main reason for moving society in such a direction. Later socialists and critics of utopian socialism viewed utopian socialism as not being grounded in actual material conditions of existing society. These visions of ideal societies competed with revolutionary and social democratic movements.

The term utopian socialism is most often applied to those socialists who lived in the first quarter of the 19th century by later socialists as a pejorative in order to dismiss their ideas as fanciful and unrealistic. A similar school of thought that emerged in the early 20th century which makes the case for socialism on moral grounds is ethical socialism.

Those anarchists and Marxists who dismissed utopian socialism did so because utopian socialists generally did not believe any form of class struggle or social revolution was necessary for socialism to emerge. Utopian socialists believed that people of all classes could voluntarily adopt their plan for society if it was presented convincingly. Cooperative socialism could be established among like-minded people in small communities that would demonstrate the feasibility of their plan for the broader society. Because of this tendency, utopian socialism was also related to classical radicalism, a left-wing liberal ideology.

Development

The term utopian socialism was introduced by Karl Marx in "For a Ruthless Criticism of Everything" in 1843 and then developed in The Communist Manifesto in 1848. The term was used by later socialist thinkers to describe early socialist or quasi-socialist intellectuals who created hypothetical visions of egalitarian, communal, meritocratic, or other notions of perfect societies without considering how these societies could be created or sustained.

In The Poverty of Philosophy, Marx criticized the economic and philosophical arguments of Proudhon set forth in The System of Economic Contradictions, or The Philosophy of Poverty. Marx accused Proudhon of wanting to rise above the bourgeoisie. In the history of Marx's thought and Marxism, this work is pivotal in the distinction between the concepts of utopian socialism and what Marx and the Marxists claimed as scientific socialism. Although utopian socialists shared few political, social, or economic perspectives, Marx and Engels argued that they shared certain intellectual characteristics. In The Communist Manifesto, Marx and Friedrich Engels wrote:

The undeveloped state of the class struggle, as well as their own surroundings, causes Socialists of this kind to consider themselves far superior to all class antagonisms. They want to improve the condition of every member of society, even that of the most favored. Hence, they habitually appeal to society at large, without distinction of class; nay, by preference, to the ruling class. For how can people, when once they understand their system, fail to see it in the best possible plan of the best possible state of society? Hence, they reject all political, and especially all revolutionary, action; they wish to attain their ends by peaceful means, and endeavor, by small experiments, necessarily doomed to failure, and by the force of example, to pave the way for the new social Gospel.

Marx and Engels associated utopian socialism with communitarian socialism which similarly sees the establishment of small intentional communities as both a strategy for achieving and the final form of a socialist society. Marx and Engels used the term scientific socialism to describe the type of socialism they saw themselves developing. According to Engels, socialism was not "an accidental discovery of this or that ingenious brain, but the necessary outcome of the struggle between two historically developed classes, namely the proletariat and the bourgeoisie. Its task was no longer to manufacture a system of society as perfect as possible, but to examine the historical-economic succession of events from which these classes and their antagonism had of necessity sprung, and to discover in the economic conditions thus created the means of ending the conflict". Critics have argued that utopian socialists who established experimental communities were in fact trying to apply the scientific method to human social organization and were therefore not utopian. On the basis of Karl Popper's definition of science as "the practice of experimentation, of hypothesis and test", Joshua Muravchik argued that "Owen and Fourier and their followers were the real 'scientific socialists.' They hit upon the idea of socialism, and they tested it by attempting to form socialist communities". By contrast, Muravchik further argued that Marx made untestable predictions about the future and that Marx's view that socialism would be created by impersonal historical forces may lead one to conclude that it is unnecessary to strive for socialism because it will happen anyway.

Social unrest between the employee and employer in a society results from the growth of productive forces such as technology and natural resources are the main causes of social and economic development. These productive forces require a mode of production, or an economic system, that's based around private property rights and institutions that determine the wage for labor. Additionally, the capitalist rulers control the modes of production. This ideological economic structure allows the bourgeoises to undermine the worker's sensibility of their place in society, being that the bourgeoises rule the society in their own interests. These rulers of society exploit the relationship between labor and capital, allowing for them to maximize their profit. To Marx and Engels, the profiteering through the exploitation of workers is the core issue of capitalism, explaining their beliefs for the oppression of the working class. Capitalism will reach a certain stage, one of which it cannot progress society forward, resulting in the seeding of socialism. As a socialist, Marx theorized the internal failures of capitalism. He described how the tensions between the productive forces and the modes of production would lead to the downfall of capitalism through a social revolution. Leading the revolution would be the proletariat, being that the preeminence of the bourgeoise would end. Marx's vision of his society established that there would be no classes, freedom of mankind, and the opportunity of self-interested labor to rid any alienation. In Marx's view, the socialist society would better the lives of the working class by introducing equality for all.

Since the mid-19th century, Engels overtook utopian socialism in terms of intellectual development and number of adherents. At one time almost half the population of the world lived under regimes that claimed to be Marxist. Currents such as Owenism and Fourierism attracted the interest of numerous later authors but failed to compete with the now dominant Marxist and Anarchist schools on a political level. It has been noted that they exerted a significant influence on the emergence of new religious movements such as spiritualism and occultism.

Utopian socialists were seen as wanting to expand the principles of the French revolution in order to create a more rational society. Despite being labeled as utopian by later socialists, their aims were not always utopian and their values often included rigid support for the scientific method and the creation of a society based upon scientific understanding.

In literature and in practice

Utopian socialist pamphlet of Swiss social medical doctor Rudolf Sutermeister (1802–1868)

Edward Bellamy (1850–1898) published Looking Backward in 1888, a utopian romance novel about a future socialist society. In Bellamy's utopia, property was held in common and money replaced with a system of equal credit for all. Valid for a year and non-transferable between individuals, credit expenditure was to be tracked via "credit-cards" (which bear no resemblance to modern credit cards which are tools of debt-finance). Labour was compulsory from age 21 to 40 and organised via various departments of an Industrial Army to which most citizens belonged. Working hours were to be cut drastically due to technological advances (including organisational). People were expected to be motivated by a Religion of Solidarity and criminal behavior was treated as a form of mental illness or "atavism". The book ranked as second or third best seller of its time (after Uncle Tom's Cabin and Ben Hur). In 1897, Bellamy published a sequel entitled Equality as a reply to his critics and which lacked the Industrial Army and other authoritarian aspects.

William Morris (1834–1896) published News from Nowhere in 1890, partly as a response to Bellamy's Looking Backward, which he equated with the socialism of Fabians such as Sydney Webb. Morris' vision of the future socialist society was centred around his concept of useful work as opposed to useless toil and the redemption of human labour. Morris believed that all work should be artistic, in the sense that the worker should find it both pleasurable and an outlet for creativity. Morris' conception of labour thus bears strong resemblance to Fourier's, while Bellamy's (the reduction of labour) is more akin to that of Saint-Simon or in aspects Marx.

The Brotherhood Church in Britain and the Life and Labor Commune in Russia were based on the Christian anarchist ideas of Leo Tolstoy (1828–1910). Pierre-Joseph Proudhon (1809–1865) and Peter Kropotkin (1842–1921) wrote about anarchist forms of socialism in their books. Proudhon wrote What is Property? (1840) and The System of Economic Contradictions, or The Philosophy of Poverty (1847). Kropotkin wrote The Conquest of Bread (1892) and Fields, Factories and Workshops (1912). Many of the anarchist collectives formed in Spain, especially in Aragon and Catalonia, during the Spanish Civil War were based on their ideas. While linking to different topics is always useful to maximize exposure, anarchism does not derive itself from utopian socialism and most anarchists would consider the association to essentially be a marxist slur designed to reduce the credibility of anarchism amongst socialists.

Many participants in the historical kibbutz movement in Israel were motivated by utopian socialist ideas. Augustin Souchy (1892–1984) spent most of his life investigating and participating in many kinds of socialist communities. Souchy wrote about his experiences in his autobiography Beware! Anarchist! Behavioral psychologist B. F. Skinner (1904–1990) published Walden Two in 1948. The Twin Oaks Community was originally based on his ideas. Ursula K. Le Guin (1929-2018) wrote about an impoverished anarchist society in her book The Dispossessed, published in 1974, in which the anarchists agree to leave their home planet and colonize a barely habitable moon in order to avoid a bloody revolution.

Related concepts

Some communities of the modern intentional community movement such as kibbutzim could be categorized as utopian socialist. Some religious communities such as the Hutterites are categorized as utopian religious socialists.

Classless modes of production in hunter-gatherer societies are referred to as primitive communism by Marxists to stress their classless nature.

Notable utopian socialists

Notable utopian communities

Utopian communities have existed all over the world. In various forms and locations, they have existed continuously in the United States since the 1730s, beginning with Ephrata Cloister, a religious community in what is now Lancaster County, Pennsylvania.

Owenite communities
Fourierist communities
Icarian communities
Anarchist communities
Others

Propellant

From Wikipedia, the free encyclopedia

A propellant (or propellent) is a mass that is expelled or expanded in such a way as to create a thrust or another motive force in accordance with Newton's third law of motion, and "propel" a vehicle, projectile, or fluid payload. In vehicles, the engine that expels the propellant is called a reaction engine. Although technically a propellant is the reaction mass used to create thrust, the term "propellant" is often used to describe a substance which contains both the reaction mass and the fuel that holds the energy used to accelerate the reaction mass. For example, the term "propellant" is often used in chemical rocket design to describe a combined fuel/propellant, although the propellants should not be confused with the fuel that is used by an engine to produce the energy that expels the propellant. Even though the byproducts of substances used as fuel are also often used as a reaction mass to create the thrust, such as with a chemical rocket engine, propellant and fuel are two distinct concepts.

Vehicles can use propellants to move by ejecting a propellant backwards which creates an opposite force that moves the vehicle forward. Projectiles can use propellants that are expanding gases which provide the motive force to set the projectile in motion. Aerosol cans use propellants which are fluids that are compressed so that when the propellant is allowed to escape by releasing a valve, the energy stored by the compression moves the propellant out of the can and that propellant forces the aerosol payload out along with the propellant. Compressed fluid may also be used as a simple vehicle propellant, with the potential energy that is stored in the compressed fluid used to expel the fluid as the propellant. The energy stored in the fluid was added to the system when the fluid was compressed, such as compressed air. The energy applied to the pump or thermal system that is used to compress the air is stored until it is released by allowing the propellant to escape. Compressed fluid may also be used only as energy storage along with some other substance as the propellant, such as with a water rocket, where the energy stored in the compressed air is the fuel and the water is the propellant.

In electrically powered spacecraft, electricity is used to accelerate the propellant. An electrostatic force may be used to expel positive ions, or the Lorentz force may be used to expel negative ions and electrons as the propellant. Electothermal engines use the electromagnetic force to heat low molecular weight gases (e.g. hydrogen, helium, ammonia) into a plasma and expel the plasma as propellant. In the case of a resistojet rocket engine, the compressed propellant is simply heated using resistive heating as it is expelled to create more thrust.

In chemical rockets and aircraft, fuels are used to produce an energetic gas that can be directed through a nozzle, thereby producing thrust. In rockets, the burning of rocket fuel produces an exhaust, and the exhausted material is usually expelled as a propellant under pressure through a nozzle. The exhaust material may be a gas, liquid, plasma, or a solid. In powered aircraft without propellers such as jets, the propellant is usually the product of the burning of fuel with atmospheric oxygen so that the resulting propellant product has more mass than the fuel carried on the vehicle.

Proposed photon rockets would use the relativistic momentum of photons to create thrust. Even though photons do not have mass, they can still act as a propellant because they move at relativistic speed, i.e., the speed of light. In this case Newton's third Law of Motion is inadequate to model the physics involved and relativistic physics must be used.

In chemical rockets, chemical reactions are used to produce energy which creates movement of a fluid which is used to expel the products of that chemical reaction (and sometimes other substances) as propellants. For example, in a simple hydrogen/oxygen engine, hydrogen is burned (oxidized) to create H2O and the energy from the chemical reaction is used to expel the water (steam) to provide thrust. Often in chemical rocket engines, a higher molecular mass substance is included in the fuel to provide more reaction mass.

Rocket propellant may be expelled through an expansion nozzle as a cold gas, that is, without energetic mixing and combustion, to provide small changes in velocity to spacecraft by the use of cold gas thrusters, usually as maneuvering thrusters.

To attain a useful density for storage, most propellants are stored as either a solid or a liquid.

Vehicle propellants

A rocket propellant is a mass that is expelled from a vehicle, such as a rocket, in such a way as to create a thrust in accordance with Newton's third law of motion, and "propel" the vehicle forward. The engine that expels the propellant is called a reaction engine. Although the term "propellant" is often used in chemical rocket design to describe a combined fuel/propellant, propellants should not be confused with the fuel that is used by an engine to produce the energy that expels the propellant. Even though the byproducts of substances used as fuel are also often used as a reaction mass to create the thrust, such as with a chemical rocket engine, propellant and fuel are two distinct concepts.

In electrically powered spacecraft, electricity is used to accelerate the propellant. An electrostatic force may be used to expel positive ions, or the Lorentz force may be used to expel negative ions and electrons as the propellant. Electothermal engines use the electromagnetic force to heat low molecular weight gases (e.g. hydrogen, helium, ammonia) into a plasma and expel the plasma as propellant. In the case of a resistojet rocket engine, the compressed propellant is simply heated using resistive heating as it is expelled to create more thrust.

In chemical rockets and aircraft, fuels are used to produce an energetic gas that can be directed through a nozzle, thereby producing thrust. In rockets, the burning of rocket fuel produces an exhaust, and the exhausted material is usually expelled as a propellant under pressure through a nozzle. The exhaust material may be a gas, liquid, plasma, or a solid. In powered aircraft without propellers such as jets, the propellant is usually the product of the burning of fuel with atmospheric oxygen so that the resulting propellant product has more mass than the fuel carried on the vehicle.

The propellant or fuel may also simply be a compressed fluid, with the potential energy that is stored in the compressed fluid used to expel the fluid as the propellant. The energy stored in the fluid was added to the system when the fluid was compressed, such as compressed air. The energy applied to the pump or thermal system that is used to compress the air is stored until it is released by allowing the propellant to escape. Compressed fluid may also be used only as energy storage along with some other substance as the propellant, such as with a water rocket, where the energy stored in the compressed air is the fuel and the water is the propellant.

Proposed photon rockets would use the relativistic momentum of photons to create thrust. Even though photons do not have mass, they can still act as a propellant because they move at relativistic speed, i.e., the speed of light. In this case Newton's third Law of Motion is inadequate to model the physics involved and relativistic physics must be used.

In chemical rockets, chemical reactions are used to produce energy which creates movement of a fluid which is used to expel the products of that chemical reaction (and sometimes other substances) as propellants. For example, in a simple hydrogen/oxygen engine, hydrogen is burned (oxidized) to create H2O and the energy from the chemical reaction is used to expel the water (steam) to provide thrust. Often in chemical rocket engines, a higher molecular mass substance is included in the fuel to provide more reaction mass.

Rocket propellant may be expelled through an expansion nozzle as a cold gas, that is, without energetic mixing and combustion, to provide small changes in velocity to spacecraft by the use of cold gas thrusters, usually as maneuvering thrusters.

To attain a useful density for storage, most propellants are stored as either a solid or a liquid.

Propellants may be energized by chemical reactions to expel solid, liquid or gas. Electrical energy may be used to expel gases, plasmas, ions, solids or liquids. Photons may be used to provide thrust via relativistic momentum.

Chemically powered

Solid propellant

Propellants that explode in operation are of little practical use currently, although there have been experiments with Pulse Detonation Engines. Also the newly synthesized bishomocubane based compounds are under consideration in the research stage as both solid and liquid propellants of the future.

Grain

Solid fuel/propellants are used in forms called grains. A grain is any individual particle of fuel/propellant regardless of the size or shape. The shape and size of a grain determines the burn time, amount of gas, and rate of produced energy from the burning of the fuel and, as a consequence, thrust vs time profile.

There are three types of burns that can be achieved with different grains.

Progressive burn
Usually a grain with multiple perforations or a star cut in the center providing a lot of surface area.
Degressive burn
Usually a solid grain in the shape of a cylinder or sphere.
Neutral burn
Usually a single perforation; as outside surface decreases the inside surface increases at the same rate.
Composition

There are four different types of solid fuel/propellant compositions:

Single-based fuel/propellant
A single based fuel/propellant has nitrocellulose as its chief explosives ingredient. Stabilizers and other additives are used to control the chemical stability and enhance its properties.
Double-based fuel/propellant
Double-based fuel/propellants consist of nitrocellulose with nitroglycerin or other liquid organic nitrate explosives added. Stabilizers and other additives are also used. Nitroglycerin reduces smoke and increases the energy output. Double-based fuel/propellants are used in small arms, cannons, mortars and rockets.
Triple-based fuel/propellant
Triple-based fuel/propellants consist of nitrocellulose, nitroguanidine, nitroglycerin or other liquid organic nitrate explosives. Triple-based fuel/propellants are used in cannons.
Composite
Composites do not utilize nitrocellulose, nitroglycerin, nitroguanidine or any other organic nitrate as the primary constituent. Composites usually consist of a fuel such as metallic aluminum, a combustible binder such as synthetic rubber or HTPB, and an oxidizer such as ammonium perchlorate. Composite fuel/propellants are used in large rocket motors. In some applications, such as the US SLBM Trident II missile, nitroglycerin is added to the aluminum and ammonium perchlorate composite as an energetic plasticizer.

Liquid propellant

In rockets, three main liquid bipropellant combinations are used: cryogenic oxygen and hydrogen, cryogenic oxygen and a hydrocarbon, and storable propellants.

Cryogenic oxygen-hydrogen combination system
Used in upper stages and sometimes in booster stages of space launch systems. This is a nontoxic combination. This gives high specific impulse and is ideal for high-velocity missions
Cryogenic oxygen-hydrocarbon propellant system
Used for many booster stages of space launch vehicles as well as a smaller number of second stages. This combination of fuel/oxidizer has high density and hence allows for a more compact booster design.
Storable propellant combinations
Used in almost all bipropellant low-thrust, auxiliary or reaction control rocket engines, as well as in some in large rocket engines for first and second stages of ballistic missiles. They are instant-starting and suitable for long-term storage.

Propellant combinations used for liquid propellant rockets include:

Common monopropellant used for liquid rocket engines include:

  • Hydrogen peroxide
  • Hydrazine
  • Red fuming nitric acid (RFNA)

Electrically powered

Electrically powered reactive engines use a variety of usually ionized propellants, including atomic ions, plasma, electrons, or small droplets or solid particles as propellant.

Electrostatic

If the acceleration is caused mainly by the Coulomb force (i.e. application of a static electric field in the direction of the acceleration) the device is considered electrostatic. The types of electrostatic drives and their propellants:

Electrothermal

These are engines that use electromagnetic fields to generate a plasma which is used as the propellant. They use a nozzle to direct the energized propellant. The nozzle itself may be composed simply of a magnetic field. Low molecular weight gases (e.g. hydrogen, helium, ammonia) are preferred propellants for this kind of system.

Electromagnetic

Electromagnetic thrusters use ions as the propellant, which are accelerated by the Lorentz force or by magnetic fields, either of which is generated by electricity:

Nuclear

Nuclear reactions may be used to produce the energy for the expulsion of the propellants. Many types of nuclear reactors have been used/proposed to produce electricity for electrical propulsion as outlined above. Nuclear pulse propulsion uses a series of nuclear explosions to create large amounts of energy to expel the products of the nuclear reaction as the propellant. Nuclear thermal rockets use the heat of a nuclear reaction to heat a propellant. Usually the propellant is hydrogen because the force is a function of the energy irrespective of the mass of the propellant, so the lightest propellant (hydrogen) produces the greatest specific impulse.

Photonic

A photonic reactive engine uses photons as the propellant and their discrete relativistic energy to produce thrust.

Projectile propellants

Compressed fluid propellants

Compressed fluid or compressed gas propellants are pressurized physically, by a compressor, rather than by a chemical reaction. The pressures and energy densities that can be achieved, while insufficient for high-performance rocketry and firearms, are adequate for most applications, in which case compressed fluids offer a simpler, safer, and more practical source of propellant pressure.

A compressed fluid propellant may simply be a pressurized gas, or a substance which is a gas at atmospheric pressure, but stored under pressure as a liquid.

Compressed gas propellants

In applications in which a large quantity of propellant is used, such as pressure washing and airbrushing, air may be pressurized by a compressor and used immediately. Additionally, a hand pump to compress air can be used for its simplicity in low-tech applications such as atomizers, plant misters and water rockets. The simplest examples of such a system are squeeze bottles for such liquids as ketchup and shampoo.

However, compressed gases are impractical as stored propellants if they do not liquify inside the storage container, because very high pressures are required in order to store any significant quantity of gas, and high-pressure gas cylinders and pressure regulators are expensive and heavy.

Liquified gas propellants

Principle

Liquified gas propellants are gases at atmospheric pressure, but become liquid at a modest pressure. This pressure is high enough to provide useful propulsion of the payload (e.g. aerosol paint, deodorant, lubricant), but is low enough to be stored in an inexpensive metal can, and to not pose a safety hazard in case the can is ruptured.

The mixture of liquid and gaseous propellant inside the can maintains a constant pressure, called the liquid's vapor pressure. As the payload is depleted, the propellant vaporizes to fill the internal volume of the can. Liquids are typically 500-1000x denser than their corresponding gases at atmospheric pressure; even at the higher pressure inside the can, only a small fraction of its volume needs to be propellant in order to eject the payload and replace it with vapor.

Vaporizing the liquid propellant to gas requires some energy, the enthalpy of vaporization, which cools the system. This is usually insignificant, although it can sometimes be an unwanted effect of heavy usage (as the system cools, the vapor pressure of the propellant drops). However, in the case of a freeze spray, this cooling contributes to the desired effect (although freeze sprays may also contain other components, such as chloroethane, with a lower vapor pressure but higher enthalpy of vaporization than the propellant).

Propellant compounds

Chlorofluorocarbons (CFCs) were once often used as propellants,[18] but since the Montreal Protocol came into force in 1989, they have been replaced in nearly every country due to the negative effects CFCs have on Earth's ozone layer. The most common replacements of CFCs are mixtures of volatile hydrocarbons, typically propane, n-butane and isobutane.[19] Dimethyl ether (DME) and methyl ethyl ether are also used. All these have the disadvantage of being flammable. Nitrous oxide and carbon dioxide are also used as propellants to deliver foodstuffs (for example, whipped cream and cooking spray). Medicinal aerosols such as asthma inhalers use hydrofluoroalkanes (HFA): either HFA 134a (1,1,1,2,-tetrafluoroethane) or HFA 227 (1,1,1,2,3,3,3-heptafluoropropane) or combinations of the two. More recently, liquid Hydrofluoroolefin (HFO) propellants have become more widely adopted in aerosol systems due to their relatively low vapor pressure, low global warming potential (GWP), and nonflammability.

Payloads

The practicality of liquified gas propellants allows for a broad variety of payloads. Aerosol sprays, in which a liquid is ejected as a spray, include paints, lubricants, degreasers, and protective coatings; deodorants and other personal care products; cooking oils. Some liquid payloads are not sprayed due to lower propellant pressure and/or viscous payload, as with whipped cream and shaving cream or shaving gel. Low-power guns, such as BB guns, paintball guns, and airsoft guns, have solid projectile payloads. Uniquely, in the case of a gas duster ("canned air"), the only payload is the velocity of the propellant vapor itself.

Lie group

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Lie_group In mathematics , a Lie gro...