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Cambridge Definition
the area of physics connected with the action of heat and other types of energy, and the relationship between them
Cambridge Link
THERMODYNAMICS – Cambridge English Dictionary
Wikipedia Definition
Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed by the four laws of thermodynamics, which convey a quantitative description using measurable macroscopic physical quantities but may be explained in terms of microscopicconstituents by statistical mechanics.