In the thermodynamics of mixtures, the fundamentals of mixture thermodynamics are presented as they are used today by process engineers and other engineering disciplines. Alongside basic equations that form the framework of thermodynamics, both state equations and G E models are introduced as material equations, and the thermodynamics of mixtures is derived step by step and consistently. The models are compared with experiments and real material behavior. Chapters on measurement methods, material behavior, phase boundaries, and chemical reactions complete the work. The book is aimed at students of process engineering and physical chemistry, as well as process and other engineers who need a solid thermodynamic foundation for the characterization of mixtures. Due to its consistent structure, the book is also suitable for self-study.