Theoretical Concepts in Physics

Malcolm Longair’s book is like a course of very good lectures that get behind the equations to reveal the context of their discovery. For example, we learn how Planck, who hated Boltzmann’s statistical approach to the theory of heat, was obliged to adopt it in order to solve the problem of black body radiation, and how this led to the concept of the quantum. There are plenty of equations but each chapter tells a compelling story of people at work, and the presentation all the way through is beautifully clear, with superb illustrations.