This book is intended for readers taking up the study of thermo­ dynamics, statistical physics and kinetics. Accordingly, readers are assumed to have a knowledge of elementary physics, higher mathematics and quantum mechanics.The sections marked by asterisks require a deeper knowledge and can be omitted on the first reading.The book aims to gradually familiarize readers with methods used in thermodynamics, statistical physics and kinetics, to show how the concrete problems should be solved and to bring readers as soon as possible to a level which enables them to tackle more specialized books and papers. It has therefore proved Jnecessary to include some matter, perhaps too simple for some, as well as problems that may be too difficult for others.