Written in a style and at a level that is accessible to undergraduates, this introduction to applied thermodynamics covers the first and second law for process applications, molecular concepts, equations of state, activity models, and reaction equilibria—all in a tightly integrated, pedagogical progression of topics. It addresses the on-going evolution in applied thermodynamics and computer technology, and integrates several widely-accessible computational tools to allow exploration of model behavior— e.g., programs for HP and TI calculators, Microsoft Excel spreadsheets, and PC's. Includes background and comparison on many of the popular thermodynamic models.