An adiabatic process exchanges no heat with its surroundings, so . A reversible adiabatic process is isentropic.
An isentropic process keeps the entropy constant. Every reversible adiabatic process is isentropic, while an irreversible adiabatic process can increase entropy.
For a fixed amount of ideal gas with constant heat capacities, the first law and give
(1)
where .

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Adiabatic process by Wikipedia Bot 1
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An adiabatic process is a thermodynamic process in which no heat is exchanged between a system and its surroundings. This means that any change in the internal energy of the system occurs solely due to work done on or by the system, rather than heat transfer. Key characteristics of adiabatic processes include: 1. **No Heat Transfer:** As mentioned, there is no energy transfer as heat (\(Q = 0\)).
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