Kilogram-force: Difference between revisions

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A '''kilogram-force''' ('''kgf''') is a [[Measurement|measurement]] unit of [[force]] which will [[acceleration|accelerate]] 1 [[kilogram]] of [[mass]] to 9.80665 [[metre|m]]/[[second|s]]<sup>2</sup>, the standard average [[acceleration due to gravity]] on [[Earth]]'s surface (referred to as '''''g<sub>n</sub>''''').<ref name=NIST-gravity/> Since a [[Newton (unit)|newton]] is defined<ref name=NASA/><ref name=NIST-newton/> as the force which will accelerate 1 kilogram  of mass to 1 m/s<sup>2</sup>, one kilogram-force is by definition equal to 9.80665 [[newton (unit)|newtons]].<ref name=NIST-kgf/> The kilogram-force is often referred to as the '''''kilopond (kp)'''''.<ref name=kp group=note/>
A '''kilogram-force''' ('''kgf''') is a [[Measurement|unit]] of [[force]] that will [[acceleration|accelerate]] 1 [[kilogram]] of [[mass]] at 9.80665 [[metre|m]]/[[second|s]]<sup>2</sup>, the standard [[acceleration due to gravity]] on [[Earth]]'s surface (referred to as '''''g<sub>n</sub>''''').<ref name=NIST-gravity/> The kilogram-force is often referred to as the '''''kilopond (kp)'''''.<ref name=kp group=note/>
 
Since a [[Newton (unit)|newton]] is defined<ref name=NASA/><ref name=NIST-newton/> as the force that will accelerate 1 kilogram  of mass at 1 m/s<sup>2</sup>, and acceleration is proportional to force, one kilogram-force is therefore equal to 9.80665 [[newton (unit)|newtons]].<ref name=NIST-kgf/> It is also equal to 2.20462 pounds-force.


The kilogram-force was not very well defined until the 3rd [[General Conference on Weights and Measures]] (Conférence Générale des Poids et Mesures, CGPM) defined '''''g<sub>n</sub>''''', the standard gravity, to be 9.80665 m/s<sup>2</sup> in 1901.<ref name=GCPM3/> Although it was once widely used, it has never been part of the [[International System of Units]] (SI) introduced in 1960 by the 11th GCPM.<ref name=GCPM11/>
The kilogram-force was not very well defined until the 3rd [[General Conference on Weights and Measures]] (Conférence Générale des Poids et Mesures, CGPM) defined '''''g<sub>n</sub>''''', the standard gravity, to be 9.80665 m/s<sup>2</sup> in 1901.<ref name=GCPM3/> Although it was once widely used, it has never been part of the [[International System of Units]] (SI) introduced in 1960 by the 11th GCPM.<ref name=GCPM11/>
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<ref name=GCPM11>[http://www.bipm.org/en/CGPM/db/11/12/ Resolution 12 of the 11th meeting of the CGPM (1960)]</ref>
<ref name=GCPM11>[http://www.bipm.org/en/CGPM/db/11/12/ Resolution 12 of the 11th meeting of the CGPM (1960)]</ref>
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A kilogram-force (kgf) is a unit of force that will accelerate 1 kilogram of mass at 9.80665 m/s2, the standard acceleration due to gravity on Earth's surface (referred to as gn).[1] The kilogram-force is often referred to as the kilopond (kp).[note 1]

Since a newton is defined[2][3] as the force that will accelerate 1 kilogram of mass at 1 m/s2, and acceleration is proportional to force, one kilogram-force is therefore equal to 9.80665 newtons.[4] It is also equal to 2.20462 pounds-force.

The kilogram-force was not very well defined until the 3rd General Conference on Weights and Measures (Conférence Générale des Poids et Mesures, CGPM) defined gn, the standard gravity, to be 9.80665 m/s2 in 1901.[5] Although it was once widely used, it has never been part of the International System of Units (SI) introduced in 1960 by the 11th GCPM.[6]

The kilogram-force is still used to some extent in a few countries, but it is generally considered to be obsolete in most countries.

Equivalent units of force

Notes

  1. 1.0 1.1 Another name for a kilogram-force. Not to be confused with "kilopounds", meaning 1,000 pounds of mass.
  2. A non-SI unit of force equal to 1,000 pound-force.

References