I'm about to wrap a course in partial differential equations. We've discussed the heat/wave equations and introductory Fourier Analysis.
I'd like to do some reading into the field of thermodynamics. Would it be best to start with an introductory text given to most lower-division under graduates or should I begin with something with a little more meat on the bones? By meat on the bones, I mean a bit more rigor and explanation for the fundamental theorems and applications. If this is not clear enough please ask for clarification, I'll be glad to provide it.
If you have a solid basis in mathematics, I would go immediately for an advanced book on statistical mechanics. Most of the introductory classes on thermodynamics are very phenomenological and they introduce a lot of math to the math-deprived physicists (been there, done that). Besides, statistical mechanics lies a solid foundations for the more historically motivated thermodynamics. I myself used the book "Introduction to modern statistical mechanics" by D. Chandler, which is a bit old-fashioned, but rather formal and thorough. Good luck with this wonderful field!