Physic- 28
What is Thermal Physics?

Thermal physics is the combined study of thermodynamics, statistical mechanics, and kinetic theory. This umbrella-subject is typically designed for physics students and functions to provide a general introduction to each of three core heat-related subjects. Other authors, however, define thermal physics loosely as a summation of only thermodynamics and statistical mechanics.[1] *Above is a picture heat pumps.*
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<---A heat pump or fridge can be represented by a similar diagram to the one used for the heat engine but with the arrows representing energy flows reversed.
Sources: http://www.saburchill.com/physics/chapters/0126.html http://en.wikipedia.org/wiki/Thermal_physics
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