Classical Gases and Liquids
نویسنده
چکیده
Because there are only a few problems in statistical mechanics that can be solved exactly, we need to find approximate solutions. We introduce several perturbation methods that are applicable when there is a small expansion parameter. Our discussion of interacting classical particle systems will involve some of the same considerations and difficulties that are encountered in quantum field theory (no knowledge of the latter is assumed). For example, we will introduce diagrams that are analogous to Feynman diagrams and find divergences analogous to those found in quantum electrodynamics. We also discuss the spatial correlations between particles due to their interactions and the use of hard spheres as a reference system for understanding the properties of dense fluids.
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