The book continues to provide the most accessible and readable approach to the study of all the vital topics and issues associated with gas dynamic processes. At every stage, the physics governing the process, its applications and limitations are discussed in detail. The elegant and concise style of the book, along with illustrations and worked-out examples, makes it eminently suitable for self-study by students and also for scientists and engineers working in the field of gas dynamics in industries and research laboratories. The computer program to calculate the coordinates of the contoured nozzle, with the method of characteristics, has been given in C language. The program listing, along with a sample output, is provided in the Appendix. In this revised and updated eighth edition, the language of the entire book has been revised to make the text impressive. Some solved examples and exercise problems using the shock theory, which would be of value to the students not only in their courses but also to their success in competitive examinations, are added. A list of exercise problems with answers added to Chapter 16 will be of value to students to be successful in their course.