Kilogram-force: Difference between revisions

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A '''kilogram-force''' ('''kgf''') is a 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]].  
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]].  


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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A kilogram-force (kgf) is a measurement unit of force which will accelerate 1 kilogram of mass to 9.80665 m/s2, the standard average acceleration due to gravity on Earth's surface (referred to as gn).[1] Since a newton is defined[2][3] as the force which will accelerate 1 kilogram of mass to 1 m/s2, one kilogram-force is by definition equal to 9.80665 newtons.

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.[4] 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.[5]

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

  • 1 kgf ≡ 9.80665 newton (symbol: N)
  • 1 kgf ≡ 980,665 dyne (symbol: dyn)
  • 1 kgf ≡ 1 kilopond (symbol: kp)
  • 1 kgf ≡ 9.80665×10-3 sthène (symbol: sn)
  • 1 kgf ≈ 2.20462 pound-force (symbol: lbf)
  • 1 kgf ≈ 2.20462×10-3 kip (symbol: kip)
  • 1 kgf ≈ 70.93164 poundal (symbol: pdl)

References