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Kilogram-force
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{{Short description|Weight on earth of a one-kilogram mass}} {{hatnote group|{{redirect|kgf||KGF (disambiguation)}}{{redirect-distinguish|Kilopond|Kilopound}}}} {{Infobox unit | bgcolor = | name = kilogram-force | image = | caption = | standard = [[Gravitational metric system]] | quantity = [[Force]] | symbol = kgf | symbol2 = | extralabel = | extradata = | units1 = SI units | inunits1 = {{convert|1|kgf|N|sigfig=7|disp=out}} | units2 = CGS units | inunits2 = {{convert|1|kgf|dyn|sigfig=7|disp=out}} | units3 = British Gravitational units | inunits3 = {{convert|1|kgf|lbf|sigfig=7|disp=out}} | units4 = Absolute English units | inunits4 = {{convert|1|kgf|pdl|sigfig=7|disp=out}} }} The '''kilogram-force''' ('''kgf''' or '''kg<sub>F</sub>'''), or '''kilopond''' ('''kp''', from {{langx|la|pondus|lit=weight}}), is a non-standard [[Gravitational metric system|gravitational metric]] unit of [[force]]. It is not accepted for use with the International System of Units (SI)<ref>[https://www.nist.gov/pml/nist-guide-si-chapter-5-units-outside-si NIST Guide to the SI, Chapter 5: Units Outside the SI]</ref> and is deprecated for most uses.{{fact|date=February 2024}} The kilogram-force is equal to the magnitude of the force exerted on one [[kilogram]] of [[mass]] in a {{val|9.80665|u=m/s2}} gravitational field ([[standard gravity]], a conventional value approximating the average magnitude of gravity on Earth).<ref>[http://physics.nist.gov/Pubs/SP330/sp330.pdf ''The international system of units (SI)''] {{Webarchive|url=https://web.archive.org/web/20160603215953/http://physics.nist.gov/Pubs/SP330/sp330.pdf |date=2016-06-03 }} β [[United States Department of Commerce]], [[National Institute of Standards and Technology|NIST]] Special Publication 330, 2008, p. 52</ref> That is, it is the [[weight]] of a kilogram under standard gravity. One kilogram-force is defined as {{val|9.80665|ul=N}}.<ref name=SP811>[[NIST]] [http://physics.nist.gov/Pubs/SP811/appenB8.html#K ''Guide for the Use of the International System of Units (SI)''] Special Publication 811, (1995) page 51</ref><ref>[http://www1.bipm.org/en/si/si_brochure/chapter2/2-2/2-2-2.html BIPM SI brochure] {{webarchive|url=https://web.archive.org/web/20040615185954/http://www1.bipm.org/en/si/si_brochure/chapter2/2-2/2-2-2.html |date=2004-06-15 }}, chapter 2.2.2.</ref> Similarly, a gram-force is {{val|9.80665|u=mN}}, and a milligram-force is {{val|9.80665|u=uN}}.
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