7. H-Theorem (& the first look to fluid dynamics)

In this lecture, I’d derive and discuss the so-called H-Theorem originally derived by L. Boltzmann. I demonstrate how the “molecular chaos” assumption is the key to irreversibility. Then I turn to general discussions about Fluid Dynamics, introduce collisional invariants and derive the master equation governing slow-varying quantities time evolution. There’s also a recommended reading for this session: Violation of Boltzmann’s H-Theorem in Real Gases.