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10 −3 J mJ: millijoule: 10 3 J kJ: kilojoule: 10 −6 J μJ: microjoule: 10 6 J MJ: megajoule: ... 1 joule is equal to (approximately unless otherwise stated): 1.0 ...
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
A type Ia supernova explosion gives off 1– 2 × 10 44 joules of energy, which is about 2.4–4.8 hundred billion yottatons (24–48 octillion (2.4– 4.8 × 10 28) megatons) of TNT, equivalent to the explosive force of a quantity of TNT over a trillion (10 12) times the mass of the planet Earth.
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)
Since there are 6.02214076 × 10 23 particles (atoms, molecules, ions etc.) per mole, 1 joule per mole is equal to 1 joule multiplied by 6.02214076 × 10 23 particles. Because of the typical order of magnitude for energy changes in chemical processes, kJ·mol −1 is normally used instead of J·mol −1.
The precise equivalence between calories and joules has varied over the years, but in thermochemistry and nutrition it is now generally assumed that one (small) calorie (thermochemical calorie) is equal to exactly 4.184 J, and therefore one kilocalorie (one large calorie) is 4184 J or 4.184 kJ. [10] [11]
one kilojoule (kJ) is 1000 joules; one kilolitre (kL) is 1000 ... 1 km 2 means one square kilometre or the area of a square that measures 1000 m on each side or 10 6 ...