A PV diagram plots the change in pressure P with respect to volume V for some process or processes. Typically in thermodynamics, the set of processes forms a cycle, so that upon completion of the cycle there has been no net change in state of the system; i.e. the device returns to the starting pressure and volume. Pressure-volume graphs are used to describe thermodynamic processes

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Thumbnail: Illustration of Thermodynamic process with pV graph