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Thermodynamics is concerned with the state of matter, and interaction
between distinct bodies of matter that changes those states.
A state of a body of matter is defined by:
These four parameters define the internal energy of a body of matter.
Two bodies of matter may exchange heat so that one loses internal
energy, and the other gains it, and they can perform work one on the
other. In that case too, one body loses energy, and the other gains it.
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