❪𝛿₂.❫ Units of Energy ○ Entries

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❪𝛿₂.❫ Units of Energy ○｜Definition｜1st｜20260419155516-00-⌔

Units of energy - Wikipedia

Units of energy

Energy is defined via work, so the SI unit of energy is the same as the unit of work – the joule (J), named in honour of James Prescott Joule¹ and his experiments on the mechanical equivalent of heat. In slightly more fundamental terms, 1 joule is equal to 1 newton metre and, in terms of SI base units

• ✤ $1\mathrm{J}=1\mathrm{kg}{\left(\frac{\mathrm{m}}{\mathrm{s}}\right)}^2=1\frac{\mathrm{kg}\cdot {\mathrm{m}}^2}{{\mathrm{s}}^2}$

An energy unit that is used in atomic physics, particle physics, and high energy physics is the electronvolt (eV). One eV is equivalent to 1.602 176 634 × 10${}^{-19}$ J.²

In spectroscopy, the unit cm${}^{-1}$ ≈ 0.000 123 9842 eV is used to represent energy since energy is inversely proportional to wavelength from the equation $E=h\nu =hc/\lambda$.

In discussions of energy production and consumption, the units barrel of oil equivalent and ton of oil equivalent are often used.

Printed 2026-06-28.

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Footnotes

1. “Definition of JOULE”. www.merriam-webster.com. 2024-02-15. Retrieved 2024-03-28. ↩

2. International Bureau of Weights and Measures (20 May 2019). The International System of Units (SI) (PDF) (9th ed.). Paris: BIPM. ISBN 978-92-822-2272-0. Retrieved 3 December 2021. ↩

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