This book is designed as per NEP 2020 guidelines and is meant for undergraduate physics students. The text begins with a coverage of kinetic theory and dynamics of ideal gases and then proceeds to discuss real gases. Thereafter the basic formalism, zeroth law, first and second laws of thermodynamics are introduced. It concludes with chapters on thermodynamic potentials and Maxwell's relations as well as classical and quantum theory of black body radiation. Written in a lucid manner, students will require…