This treatise builds logically from the basics of temperature and heat to build the laws of Thermodynamics. The surprising thing is that back in the 1920s when this edition came out, scientists didn't know exactly how to define the Second Law of Thermodynamics. That is the one that says that Entropy of a system tends toward disorder.

The book is not perfect, there are things that annoyed me about it. The main thing was that Planck used the CGS system of measure. I suppose I can understand that it was just typical of how measurements were made back then. That is why it didn't lower my score for the book at all. At least he used a form of metric. ( )