Synopsis This book “Text Book of Thermodynamics” is primarily intended for students preparing for degree and honours students of various universities. Thermodynamics include a large number of topics. Since the present day students is some what pressed for time, the treatment has been kept short and direct. Only such historical and additional information has been given as may possibly interest the more serious type of students. An attempt has bee made to make the language as simple as possible. We hope this book will be found useful by the students and teachers in the various institution of India.