Many people, including physicists, are confused about what the Second Law of thermodynamics really means, about how it relates to the arrow of time, and about whether it can be derived from classical mechanics. They also wonder what entropy really is: Is it all about information? But, if so, then, what is its relation to fluxes of heat?

One might ask similar questions about probabilities: Do they express subjective judgments by us, humans, or do they reflect facts about the world, i.e. frequencies. And what notion of probability is used in the natural sciences, in particular statistical mechanics?

This book addresses all of these questions in the clear and pedagogical style for which the author is known. Although valuable as accompaniment to an undergraduate course on statistical mechanics or thermodynamics, it is not a standard course book. Instead it addresses both the essentials and the many subtle questions that are usually brushed under the carpet in such courses. As one of the most lucid accounts of the above questions, it provides enlightening reading for all those seeking answers, including students, lecturers, researchers and philosophers of science.

Jean Bricmont (born in 1952) is a theoretical physicist, and a retired professor at the Université Catholique de Louvain. He works on statistical and mathematical physics. He is mostly known to the non-academic audience for co-authoring Fashionable Nonsense (also known as Intellectual Impostures) with Alan Sokal, in which they criticize relativism in the philosophy of science. He also published Making Sense of Quantum Mechanics and Quantum Sense and Nonsense with Springer.