Changes in volume refer to the increase or decrease in the amount of space occupied by a system. When there is a change in volume, it can lead to work being done on or by the system. This is because work is directly related to the displacement of a system against an external force, and a change in volume involves the movement or displacement of the system's particles. For example, when a gas expands and occupies a larger volume, it can do work by pushing against a piston, while a gas being compressed and having its volume reduced requires work to be done on it. Therefore, changes in volume have a direct impact on the work done either by or on the system.
