Thermodynamics is the branch of physical science concerned with the interrelationship and interconversion of different forms of energy and the behaviour of systems in terms of certain basic quantities, such as pressure, temperature etc. This encyclopaedic work on Thermodynamics encompasses all vital authoritative information, laws, theories etc. on the subject. Wherever necessary illustrations and examples are given for easy comprehension. Definitely, this will serve the purpose of students, teachers, researchers and scientists in the field.