[2_PercentMilk]

So the average kinetic energy is only proportional to temperature and not pressure or volume. But the kinetic energy of a single molecule is affected by pressure and volume. So if a single molecule is affected by these factors why wouldn't the average kinetic energy also be affected by these?

[Borek]

Think about scaling factors that allow converting average kinetic energy of a single molecule to pressure exerted by number of molecules.