This classic textbook is the definitive introduction to the thermodynamic behavior of materials systems. Written as a basic text for advanced undergraduates and first year graduate students in metallurgy, metallurgical engineering, ceramics, or materials science, it presents the underlying thermodynamic principles of materials and their plethora of applications. Topics include solid-gas reactions, solution thermodynamics, and free energy formalism. The book presents thorough phase diagrams and an abundance of practical examples to supplement the text and enhance comprehension. This volume has also proven to be of interest to working professionals in need of a reference or refresher course.