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List of orders of magnitude for energy; Factor (joules) SI prefix Value Item 10 −34: 6.626 × 10 −34 J: Energy of a photon with a frequency of 1 hertz. [1]8 × 10 −34 J: Average kinetic energy of translational motion of a molecule at the lowest temperature reached (38 picokelvin [2] as of 2021)
The joule (/ dʒ uː l / JOOL, or / dʒ aʊ l / JOWL; symbol: J) is the unit of energy in the International System of Units (SI). [1] In terms of SI base units, one joule corresponds to one kilogram-square metre per square second (1J=kg⋅m 2 ⋅s −2).
kilojoule: kJ kJ 1.0 kJ (240 cal) hectojoule: hJ hJ 1.0 hJ (24 cal) decajoule: daJ daJ 1.0 daJ (2.4 cal) joule: J J 1.0 J (0.24 cal) decijoule: dJ dJ 1.0 dJ (0.024 cal) centijoule: cJ cJ 1.0 cJ (0.0024 cal) millijoule: mJ mJ 1.0 mJ (0.00024 cal) microjoule: μJ (uJ) μJ 1.0 μJ (2.4 × 10 −7 cal) nanojoule: nJ nJ 1.0 nJ (2.4 × 10 −10 cal ...
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
joule per kelvin (J⋅K −1) constant of integration: varied depending on context speed of light (in vacuum) 299,792,458 ... Dirac notation integral the inverse of ...
The joule per mole (symbol: J·mol −1 or J/mol) is the unit of energy per amount of substance in the International System of Units (SI), such that energy is measured in joules, and the amount of substance is measured in moles. It is also an SI derived unit of molar thermodynamic energy defined as the energy equal to one joule in one mole of ...
one kilojoule (kJ) is 1000 joules; one kilolitre (kL) is 1000 litres; one kilobaud (kBd) is 1000 bauds; one kilohertz (kHz) is 1000 hertz; one kilodalton (kDa) is 1000 daltons; one kilobit (kb) is 1000 bits; one kilobyte (kB) is 1000 bytes; one kiloohm is (kΩ) is 1000 ohms; one kilosecond (ks) is 1000 seconds; one kilotonne (kt) is 1000 tonnes
In use the joule and kilojoule are common, with larger multiples seen in limited contexts. In addition, the kilowatt-hour , a composite unit formed from the kilowatt and hour, is often used for electrical energy; other multiples can be formed by modifying the prefix of watt (e.g. terawatt-hour).