Although there is no dearth of elegant books on Thermodynamics for undergraduate and post-graduate students, yet there are few books written in a form which focusses attention on all the important aspects of Thermodynamics and holds the interest of inquisitive students. This book provides an authoritative account of every aspect of Thermodynamics of current interest and demonstrates progress in this subject that has been made in the recent past. Every topic included in this book is self-sufficient and has been profusely illustrated. Each topic has been written in a clear and explanatory style to provide both straightforward concepts and invaluable background information. This approach, combined with an extensive cross referencing system, enables the reader to grasp straightforward concepts in valuable background information and enables the reader to place each chapter in a broader scientific context. The chapters have been arranged in a conventional way, as it may prove easy for students to pass from one to another with continuity.