# Illustration Isobaric, Isochoric, Isothermal and Adiabatic Process on the p-V Diagram

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Four different processes plotted in a pressure-volume diagram:

• isobaric - Pressure $$\mathit{\Pi}$$ remains constant during this process. For example, such a process can be an expansion of the gas, which results in the change of volume.
• isochoric - Volume $$V$$ remains constant during this process.
• isothermal - Temperature $$T$$ remains constant during this process.
• adiabatic - There is no heat exchange of the system with the environment during this process. Consequently, the system must be isolated to be adiabatic! The entropy remains constant thereby.