Hunkins Experiments
The Secret Life of Machines
An entertaining site that communicates ideas through cartoon drawings. Discover how simple machines and gadgets operate, such as fax machines and washing machines.
Physics Hypertextbook
The Physics Hypertextbook: Refrigerators
This resource provides a detailed discussion about how refrigerators work. Also includes a history of the invention of refrigerators, and the physics behind how they work.
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University of Sydney (Australia)
Thermal Physics Module: Refrigerators and Heat Pumps [Pdf]
Refrigerators and heat pumps are described. Their operation is explained and the variables which improve their efficiency is discussed.
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.