Units of energy
Units used to measure energy / From Wikipedia, the free encyclopedia
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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 Joule[1] 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
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An energy unit that is used in atomic physics, particle physics and high energy physics is the electronvolt (eV). One eV is equivalent to 1.602176634×10−19 J.[2]
In spectroscopy the unit cm−1 ≈ 0.0001239842 eV is used to represent energy since energy is inversely proportional to wavelength from the equation .
In discussions of energy production and consumption, the units barrel of oil equivalent and ton of oil equivalent are often used.