Unit of Energy

Unit of measurement
unit of work
unit of heat
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Because energy is defined via work, the SI unit of energy is the same as the unit of work – the joule (J), named in honor of James Prescott Joule 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   J = 1   k g ( m s ) 2 = 1   k g ⋅ m 2 s 2 {\displaystyle 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 1.60217653×10−19 J. In spectroscopy the unit cm−1 = 0.000123986 eV is used to represent energy since energy is inversely proportional to wavelength from the equation E = h ν = h c / λ {\displaystyle 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. Cubic mile of oil is sometimes used as a unit of energy in discussions of global scale energy economics. When discussing amounts of energy released in explosions or bolide impact events, the TNT equivalent unit is often used. The joule is the most used unit of energy.
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Units of Energy
Unit of energy
Energy units
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