This textbook provides an alternative, inductive treatment of traditional Engineering Thermodynamics, e.g. energy and its transformations in engineering systems, and introduces the notion of eXergy. The book begins with energy methods developed in mechanics and transitions to thermodynamics by introducing both 1st and 2nd Laws of Thermodynamics immediately, incorporating more-advanced concepts using practical applications. This methodology continues throughout the text, wherein consideration of a specific example leads to general conclusions. At the same time, the author introduces eXergy, also called “Availability,” a measure of the potential of a substance to produce useful mechanical work in being brought from its current state to the conditions of the local environment.