In an irreversible process , finite changes are made; therefore the system is not at equilibrium throughout the process. At the same point in an irreversible cycle, the system will be in the same state, but the surroundings are permanently changed after each cycle. A reversible process changes the state of a system in such a way that the net change in the combined entropy of the system and its surroundings is zero. Reversible processes define the boundaries of how efficient heat engines can be in thermodynamics and engineering: a reversible process is one where no heat is lost from the system as "waste", and the machine is thus as efficient as it can possibly be see Carnot cycle.
In some cases, it is important to distinguish between reversible and quasistatic processes.
7.5 Reversible systems
Reversible processes are always quasistatic, but the converse is not always true. Historically , the term Tesla principle was used to describe amongst other things certain reversible processes invented by Nikola Tesla. The principle stated that some systems could be reversed and operated in a complementary manner.
It was developed during Tesla's research in alternating currents where the current's magnitude and direction varied cyclically. During a demonstration of the Tesla turbine , the disks revolved and machinery fastened to the shaft was operated by the engine. If the turbine's operation was reversed, the disks acted as a pump. From Wikipedia, the free encyclopedia. For other forms of reversibility, see reversibility disambiguation.
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The classical Carnot heat engine. Classical Statistical Chemical Quantum thermodynamics. Zeroth First Second Third. System properties. Note: Conjugate variables in italics. Work Heat. Material properties. Carnot's theorem Clausius theorem Fundamental relation Ideal gas law.
Free energy Free entropy.
History Culture. History General Entropy Gas laws. Entropy and time Entropy and life Brownian ratchet Maxwell's demon Heat death paradox Loschmidt's paradox Synergetics. Caloric theory Theory of heat.
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