Engineering Thermodynamics has been designed for students of all branches of engineering specially undergraduate students of Mechanical Engineering. The book will also serve as reference manual for practising engineers. The book has been written in simple language and systematically develops the concepts and principles essential for understanding the subject. The text has been supplemented with solved numerical problems, illustrations and question banks. The present book has been divided in five parts:  Thermodynamic Laws and Relations  Properties of Gases and Vapors  Thermodynamics Cycles  Heat Transfer and Heat Exchangers  Annexures