An isochoric process, also called an isometric process, is a thermodynamic process in which the volume stays constant; . This implies that the process does no pressure-volume work, since such work is defined by
- ,
By applying the first law of thermodynamics, we can deduce that
On a P-V diagram, an isochoric process appears as a straight vertical line.
See also: isobaric process, isothermal process, adiabatic process, cyclic process.