Until now the topic of gas dynamics has been included as a section in comprehensive textbooks on physical chemistry, or discussed at too high a level for undergraduate or graduate students. This book, based on courses given by the author in several countries, aims to fill this gap. To make the subject more accessible to students, there is a very strong emphasis on current applications of the theory. Part I introduces the kinetic theory of gases with relevance to molecular energies and intermolecular forces. Part II focuses on how these theories are used to explain real techniques and phenomena involving gases, allowing students to answer questions such as: 'How does a Laser work?' and 'What is a shock wave?' By stressing the practical implications, the book explains the theory of gas dynamics in a highly readable and comprehensible manner.