This book focuses on the discovery and consequences of the first and second laws of thermodynamics. Over the twentieth century, scientists added two more laws for the sake of completeness. The first of these, now known as the zeroth law, was assumed to be true in the nineteenth century but didn’t then have the status of a law. The second of the additional laws, now known as the third law, pertains to materials at ultracold temperatures very near to absolute zero.
