I've studied differential geometry just enough to be confident with differential forms. Now I want to see application of this formalism in thermodynamics.
I'm looking for a small reference, to learn familiar concepts of (equilibrium?) thermodynamics formulated through differential forms.
Once again, it shouldn't be a complete book, a chapter at max, or an article.
UPD Although I've accepted David's answer, have a look at the Nick's one and my comment on it.