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kilogram-force
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{{short description|Unit of force in gravitational metric system; weight of one kilogram of mass in standard Earth gravity}}{{redirect|kgf|other uses|KGF (disambiguation){{!}}KGF}}{{Distinguish|Kilopound}}







factoids
| units2 = CGS units1dyndisp=out}}| units3 = British Gravitational units1lbfdisp=out}}| units4 = Absolute English units1pdldisp=out}}}}The kilogram-force (kgf or kgF), or kilopond (kp, from Latin pondus meaning weight), is a gravitational metric unit of force. It 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).The international system of units (SI) – United States Department of Commerce, NIST Special Publication 330, 2008, p. 52 Therefore, one kilogram-force is by definition equal to {{val|9.80665|ul=N}}.NIST Guide for the Use of the International System of Units (SI) Special Publication 811, (1995) page 51BIPM SI brochure {{webarchive|url=https://web.archive.org/web/20040615185954weblink |date=2004-06-15 }}, chapter 2.2.2. Similarly, a gram-force is {{val|9.80665|u=mN}}, and a milligram-force is {{val|9.80665|u=uN}}. One kilogram-force is approximately 2.204622 pound-force.Kilogram-force is a non-standard unit and is classified in SI Metric System as a unit that is unacceptable for use with SI.NIST Guide to the SI, Chapter 5: Units Outside the SI

History

The gram-force and kilogram-force were never well-defined units until the CGPM adopted a standard acceleration of gravity of 980.665 cm/s2 for this purpose in 1901,Resolution of the 3rd CGPM (1901) though they had been used in low-precision measurements of force before that time.The kilogram-force has never been a part of the International System of Units (SI), which was introduced in 1960. The SI unit of force is the newton.Prior to this, the unit was widely used in much of the world and it is still in use for some purposes. The thrust of a rocket engine, for example, was measured in kilograms-force in 1940s Germany, in the Soviet Union (where it remained the primary unit for thrust in the Russian space program until at least the late 1980s), and it is still used today in China and sometimes by the European Space Agency.The term "kilopond" has been declared obsoleteEuropean Economic Community, Council Directive of 18 October 1971 on the approximation of the laws of the Member States relating to units of measurement (Directive 71/354/EEC), Annex, Chapter III. and should no longer be used.It is also used for tension of bicycle spokes,WEB,weblink Balancing wheel tension with the TM-1 Spoke Tension Meter, The recommended tension for spokes in bicycle wheels can be as low as 80 Kilograms force (Kfg) and as high as 230 Kilograms force., Park Tool, Cyclingnewstechnical atmosphere (at) and very close to 1 bar (unit)>bar and the standard atmosphere (atm), for the draw weight of bows in archery, and to define the "metric horsepower" (PS) as 75 metre-kiloponds per second. In addition, kilograms force is the standard unit used for Vickers hardness testing.{{GravEngAbs|system=metric}}

Related units

The tonne-force, metric ton-force, megagram-force, and megapond (Mp) are each 1000 kilograms-force.The decanewton or dekanewton (daN), exactly 10 N, is used in some fields as an approximation to the kilogram-force, because it is close to the 9.80665 N of 1 kgf.{{Units of force}}

See also

References

{{Reflist}}

External links



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