This book is a great introduction to thermal physics for a physicist, and a fantastic book for chemists who found physical chemistry hand-waving.  This books wants you to understand what's going on more than anything.  Very self-teachable, that's how I did it.  It is on the easy side, and the problems are relatively simple, but if you want an introduction, this is it.  Helps with the conceptual understanding better than any other thermodynamics book I've ever read (all physical chemistry books are written by people not able to communicate or don't really understand thermodynamics, just memorize).  Stat mechanics in it is a little weak, but still a good introduction.