Adiabatic Process

A process in which the system does not exchange heat with the surroundings. In an adiabatic process, compression always results in warming, expansion in cooling.

Very fast processes can often be considered adiabatic with respect to heat exchange with the surroundings, because heat exchange is not instantaneous.

p = Pressure
V = Volume
T = Temperature
γ = Ratio of heat capacities
ΔW = Work done on system

The entropy of a substance is that thermal property of it which remains constant when the substance neither gains nor loses heat from external sources, as in adiabatic operations, and which is increased or reduced when heat is given to or taken from the gas.

Consequently adiabatic operations are often called isentropic.

See also: Adiabat, Adiabatic Compression, Adiabatic Cooling, Adiabatic Efficiency, Adiabatic Expansion, Adiabatic Saturation Process, Polytropic Process.

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Subjects: Thermodynamics