This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Conceptual experiment reversibility irreversibility.svg en conceptual representation of gas sum of individual solid particles in collision movement When the movement of the piston is slow top the pressure is uniform but when it is rapid bottom the pressure the surface of the acting piston is not the average pressure in the gas own