A thermodynamic process without transfer of heat or mass of substances between a thermodynamic system and its surroundings:

(1)	$\begin{array}{l}\displaystyle \frac{\partial (Q^{\downarrow}-Q^{\uparrow})}{\partial t} = 0\end{array}$

In an adiabatic process, the energy is transferred to the surroundings only as work.

There three most popular types of adiabatic fluid expansions:

Isentropic expansion

Free expansion

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See also