C. A. Ward Thermodynamics is reviewed. Quantum mechanics is introduced and used to define the possible microscopic states of macroscopic systems. For macroscopic systems in thermodynamic equilibrium, the concept of ensemble average is introduced and the postulates of statistical mechanics are used to calculate the thermodynamic properties of selected systems from a knowledge of their molecular nature. Entropy is interpreted in terms of quantum mechanical concepts. The thermal properties of solids, of gases adsorbed on solid surfaces, of electrons in solids, of radiation, and of ideal gases are studied.
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