This course text provides an accessible introduction to thermodynamics and statistical mechanics, at a level that is suitable for both physics and engineering majors. Concepts are approached in a pedagogical way, using precise language, clear explanations and discussions of how the ideas developed over time. All of the material required for a one-semester (14-week) course in thermodynamics and statistical mechanics is provided, alongside worked examples, concept questions, worksheets, and independent-study exercises. The material has been thoroughly class-tested and acts as a core text for undergraduate courses, particularly for students who find the topics challenging. It also acts as valuable supplementary reading for postgraduates who would benefit from the supplementary material and clear explanations of the concepts. Key features Provides an accessible introduction to thermodynamics and statistical mechanics.  Suitable for mixed classes of physics and engineering majors. Acts as a core text for undergraduate courses, particularly for students who find the topics challenging. Introduces concepts with stories by key physicists, providing a historical perspective on how the concepts were developed. Includes worked examples, concept questions, worksheets and independent-study exercises.