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Isentropic process

Isentropic process An example of an isentropic process is if a gas is compressed in a fully insulated cylinder without heat exchange with the surroundings. Or if a gas is expanded through a nozzle so quickly that no heat exchange with the surroundings has time to take place. The relation for such a process is:
When the entropy is a gas that has been compressed or expanded is constant, no heat exchange with the surroundings takes place. This change in state follows Poisson's law.