However, when we get to this state what happens here at high temperatures? Suppose this is 1000 ATM and still zero Celsius. So our volume has decreased tremendously and our pressure has increased but temperature remains the same. So at very high pressures the distance between any two molecules is approximately the same as the size of the molecule itself. Now, and I claim under this condition the kinetic theory breaks down. So let's see, what about the kinetic theory that breaks down in this system?