The first law of thermodynamics is a version of the law of conservation of energy, specialized for thermodynamical systems. It is usually formulated by stating that the change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings. The law of conservation of energy can be stated: The energy of an isolated system is constant.
Read more about First Law Of Thermodynamics: Original Statements, Description, Various Statements of The Law For Closed Systems, Evidence For The First Law of Thermodynamics For Closed Systems, State Functional Formulation For Infinitesimal Processes, Spatially Inhomogeneous Systems, First Law of Thermodynamics For Open Systems, History
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