This work covers in a comprehensive and coherent manner, fundamentals of thermodynamics and their engineering applications. Beginning with elementary ideas of pressure, temperature and heat it develops the laws of thermodynamics from experimental and engineering backgrounds. Steam turbine is covered with a simple and easy method of drawing velocity triangles. A general overview of thermal science is presented as it relates to heat transfer. The book also discusses various power cycles for improving efficiency. Key features include: practical data presented for all laws of thermodynamics; emphasis on efficent energy conversion such as fuel and combustion, nuclear energy and direct energy; and 311 diagrams.