Circle Theorems

Entropy and The Recurrence Theorem There’s a subtle problem with this explanation of the second law of thermodynamics. Let’s take an example of an empty box that contains a vacuum. Let’s introduce some air into one corner of the box. This is a low entropy starting state for this system of particles. When left alone, the air will naturally expand out into the box, occupying a larger volume with a wider range of random particle motions. The air went from a low entropy state into a higher entropy s