This lecture covers the statistical mechanics of liquids, focusing on the theory of the liquid state, classical statistical mechanics, reduced distribution functions, the pair correlation function, and scattering from a liquid. The instructor explains the challenges in modeling liquids due to the disorder and strong interactions among atoms, the partition function, and the link between the pair correlation function and the structure factor. The lecture also delves into the concept of reduced distribution functions, the isotropic medium, and the probability of finding particles at different distances. Additionally, it discusses the scattering of X-rays from atoms, the structure factor, and provides examples of scattering from silica and water.