The primary objective of the text is to help students in Mechanical Engineering curricula develop an orderly approach in understanding the obscure concepts such as the energy and the exergy of a system. In doing so, a total of two hundred illustrative solved problems are provided, and five hundred and fifty unsolved problems with engineering emphasis are contained in the text. In addition, each chapter contains True-False and a Multiple Choice Test sections. Both of these tests are aimed for self-check of student’s weakness or strength on the highlights of the related chapter.