Constant Volume and Pressure in Thermodynamics

Thermodynamic processes can happen at constant volume or at constant pressure. An isochoric process is a constant-volume process. In this case, the volume does not change, so the work done by the system is zero. The first law of thermodynamics still applies, so any heat added or removed changes the internal energy of the sys...

A thermodynamic process that occurs at constant volume is called an isochoric process.

Consider evaporation occurring inside a sealed ecosystem. Since the water vapour does not escape the container, the volume remains constant, and the process is isochoric.

At constant volume, no work is done by the system. Now, applying the first ...