Internal-energy, U [J], can neither be destroyed nor created (first law of thermodynamics: diU/dt = 0). Note that internal (subscript i), as opposed to external (subscript e), must be distinguished from "internal-energy", U, which contrasts with "Helmholtz energy", A, as enthalpy, H, contrasts with Gibbs energy, G.
Abbreviation: U [J]
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- Joule [J]; 1 J = 1 N·m = 1 V·C; 1 cal = 4.184 J
MitoPedia concepts: Ergodynamics