The fourth edition of this widely acclaimed textbook provides a concise and easy-to-understand introduction to chemical thermodynamics. Beginning with an examination of equilibrium in familiar mechanical objects, the book gives a straightforward account of the factors that determine equilibrium in chemical systems. The underlying principles of thermodynamics are discussed, then applied to a wide range of physicochemical systems. The problems of non-ideal solutions and the concept of activity are covered, and the text offers a useful introduction to the molecular basis of thermodynamics. This new edition is fully illustrated, and features a clearer text design and larger format. Many new sample problems and worked examples are included. Students in thermodynamics will continue to find this popular book a clear introduction to an important subject.