The basic elements of this textbook are the scientific completeness, the coexistence of theoretical and empirical knowledge, the rational structure of the material presented, as well as the careful wording in the text. Its development is addressed to all those interested in the study, instruction, and the applications of Thermodynamics. In particular, its structure is addressed to students of engineering and applied sciences, of which Thermodynamics constitutes a structural element of theoretical knowledge and study of technological applications.