Kilogram-force
kilogram-force | |
---|---|
Unit system | Gravitational metric system |
Unit of | Force |
Symbol | kgf |
Conversions | |
1 kgf in ... | ... is equal to ... |
SI units | 9.806650 N |
CGS units | 980,665.0 dyn |
British Gravitational units | 2.204623 lbf |
Absolute English units | 70.93164 pdl |
The kilogram-force (kgf or kgF), or kilopond (kp, from
History
The gram-force and kilogram-force were never well-defined units until the
Prior to this, the unit was widely used in much of the world. It is still in use for some purposes, for example, it is used for the tension of bicycle
Base | Force | Weight | Mass | ||
---|---|---|---|---|---|
2nd law of motion | m = F/a | F = W ⋅ a/g | F = m ⋅ a | ||
System | GM | M | CGS | MTS | SI |
Acceleration (a) | m/s2 | m/s2 | Gal | m/s2 | m/s2 |
Mass (m) | hyl
|
kilogram | gram | tonne | kilogram |
Force (F), weight (W) |
kilopond
|
kilopond | dyne | sthène | newton |
Pressure (p) | technical atmosphere
|
standard atmosphere | barye | pieze |
pascal |
In 1940s, Germany, the thrust of a rocket engine was measured in kilograms-force,[citation needed] in the Soviet Union it remained the primary unit for thrust in the Russian space program until at least the late 1980s.[citation needed]
The term "kilopond" has been declared obsolete.[14]
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.
The gram-force is 1⁄1000 of a kilogram-force.
newton | dyne | kilogram-force, kilopond |
pound-force | poundal | |
---|---|---|---|---|---|
1 N | ≡ 1 kg⋅m/s2 | = 105 dyn | ≈ 0.10197 kp | ≈ 0.22481 lbf | ≈ 7.2330 pdl |
1 dyn | = 10–5 N | ≡ 1 g⋅cm/s2 | ≈ 1.0197×10−6 kp | ≈ 2.2481×10−6 lbf | ≈ 7.2330×10−5 pdl |
1 kp | = 9.80665 N | = 980665 dyn | ≡ gn × 1 kg | ≈ 2.2046 lbf | ≈ 70.932 pdl |
1 lbf | ≈ 4.448222 N | ≈ 444822 dyn | ≈ 0.45359 kp | ≡ gn × 1 lb | ≈ 32.174 pdl |
1 pdl | ≈ 0.138255 N | ≈ 13825 dyn | ≈ 0.014098 kp | ≈ 0.031081 lbf | ≡ 1 lb⋅ft/s2 |
The value of gn as used in the official definition of the kilogram-force (9.80665 m/s2) is used here for all gravitational units. |
See also
References
- ^ NIST Guide to the SI, Chapter 5: Units Outside the SI
- ^ The international system of units (SI) Archived 2016-06-03 at the Wayback Machine – United States Department of Commerce, NIST Special Publication 330, 2008, p. 52
- ^ Special Publication 811, (1995) page 51
- ^ BIPM SI brochure Archived 2004-06-15 at the Wayback Machine, chapter 2.2.2.
- ^ Resolution of the 3rd CGPM (1901)
- ^ Proceedings of the 3rd General Conference on Weights and Measures, 1901, pages 62–64 and 68, (french)
- ^ Proceedings of the 5th General Conference on Weights and Measures, 1913, pages 51 and 56, (french)
- ^ "Resolution 7 of the 9th meeting of the CGPM (1948)". Archived from the original on 2020-06-22. Retrieved 2021-03-02.
- ^ "Balancing wheel tension with the TM-1 Spoke Tension Metre". Cyclingnews. Retrieved 2013-09-03.
The recommended tension for spokes in bicycle wheels can be as low as 80 Kilograms force (Kfg) and as high as 230 Kilograms force. Author=Park Tool
- OCLC 609421363.
Breaking load (BL): The strength of a wire and its actual force (usually given in grams, grams-force, mN, etc.) required to break a particular wire in a tensile pull. It is not tensile strength, which by definition is the force per unit area.
- OCLC 401168960.
In the past the units for Vickers hardness were kg/mm2; in Table 12.6 we use the SI units of GPa.
- .
- .
- ^ European Economic Community, Council Directive of 18 October 1971 on the approximation of the laws of the Member States relating to units of measurement