energy, E

https://doi.org/10.1351/goldbook.E02101
In mechanics the sum of potential energy and kinetic energy. In thermodynamics the thermodynamic energy or thermodynamic energy increase, ΔU, is the sum of heat and work brought to the system. Only changes in energy are measurable. For photons E=h νwhere h is the Planck constant and ν the frequency of radiation. In relativistic physics E=m c2 where c is the speed of light and m the mass.
Source:
Green Book, 2nd ed., p. 12 [Terms] [Book]
Citation: 'energy' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.E02101 RIS BibTex EndNote
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