The First Law of Thermodynamics
When the state of a closed system is changed from an initial equilibrium state to a final equilibrium state solely by the performance of work, the amount of work needed depends only on the initial and final equilibrium states of the system and not on the means by which the work is performed nor on the intermediate states through which the system passes.
KeywordsHeat Capacity Internal Energy Specific Heat Capacity Thermal Contact Thermal Interaction
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