A pressure-volume (P-V) diagram is a graphical representation used in thermodynamics to illustrate the relationship between the pressure (P) and volume (V) of a system, typically a gas, during various processes. The diagram provides insights into the behavior of gases during expansion, compression, and phase changes. ### Key Features of a P-V Diagram: 1. **Axes**: - The horizontal axis (x-axis) represents volume (V), often in liters or cubic meters.
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A pressure-volume diagram plots a thermodynamic process in the plane of pressure and volume . For quasistatic boundary work, work done by the system is . Compression and expansion have opposite signs under this convention.
For a closed cycle, the oriented enclosed area equals the net boundary work. A clockwise loop gives positive net work by the system. If the process is strongly irreversible, the external pressure at the moving boundary, rather than an assumed uniform equilibrium system pressure, must be used to calculate the actual work.