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- Dictionaryinternal energy
noun
- 1. the energy in a system arising from the relative positions and interactions of its parts.
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noun
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Energy contained in a system, excluding energy due to its position as a body in external force fields or its overall motion
The internal energy of a thermodynamic system is the energy contained within it, measured as the quantity of energy necessary to bring the system from its standard internal state to its present internal state of interest, accounting for the gains and losses of energy due to changes in its internal state, including such quantities as magnetization. Wikipedia