In an ideal gas, the molecules are assumed to be point particles with no intermolecular interactions. This means that the volume of an ideal gas is only determined by the temperature and pressure, and not by the number of molecules or the nature of the molecules.
The entropy of a system is a measure of the disorder or randomness of the system. In an ideal gas, the molecules are completely disordered and have no preferred positions or orientations. This means that the entropy of an ideal gas is only determined by the temperature and volume, and not by the pressure or the number of molecules.
Therefore, pressure changes have no effect on the entropy of substances in ideal gas states.
