Georgia State University
Georgia State University: Hyper Physics: Heat Pump
Heat flow from a hot region to a cold region is described and explained. Applications of this phenomenon (specifically heat pumps and refrigerators) are discussed. Excellent graphics.
Texas Education Agency
Texas Gateway: Thermodynamics: Glossary
This is a glossary of terms and definitions used in Chapter 15: Thermodynamics from the AP Physics online text.
University of Sydney (Australia)
Equations for Thermodynamics
An exhaustive list of equations and formulas which are commonly used in thermal physics (including equations for triple point). Equations are organized according to category. Meaning of the symbols is clearly stated.