Adiabatic processes

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adiabatic process

A process in which a system does not interact with its surroundings by virtue of a temperature difference between them.

In an adiabatic process any change in internal energy (for a system of fixed mass) is solely a consequence of working. For an ideal gas and for most atmospheric systems, compression results in warming, expansion results in cooling.
See dry-adiabatic process, moist-adiabatic process.