Dyne

Unit of force in the CGS system

For people with the name, see Dyne (name).

dyne

Unit system| CGS units
Unit of| force
Symbol| dyn
Conversions
1 dyn in ...| ... is equal to ...
CGS base units|  1 g⋅cm/s2
SI units|  10−5 N
British Gravitational System|  2.248089×10−6 lbf

The dyne (symbol: dyn; from Ancient Greek δύναμις (dúnamis) 'power, force') is a derived unit of force specified in the centimetre–gram–second (CGS) system of units, a predecessor of the modern SI.

## History

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The name dyne was first proposed as a CGS unit of force in 1873 by a Committee of the British Association for the Advancement of Science.[1]

## Definition

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The dyne is defined as "the force required to accelerate a mass of one gram at a rate of one centimetre per second squared".[2] An equivalent definition of the dyne is "that force which, acting for one second, will produce a change of velocity of one centimetre per second in a mass of one gram".[3]

One dyne is equal to 10 micronewtons, 10−5 N or to 10 nsn (nanosthenes) in the old metre–tonne–second system of units.

* 1 dyn = 1 g⋅cm/s2 = 10−5 kg⋅m/s2 = 10−5 N
* 1 N = 1 kg⋅m/s2 = 105 g⋅cm/s2 = 105 dyn

Units of force

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| newton | dyne | kilogram-force,
kilopond  | pound-force | poundal

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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 (9.80665 m/s2) as used in the official definition of the kilogram-force is used here for all gravitational units.

## Use

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The dyne per centimetre is a unit traditionally used to measure surface tension. For example, the surface tension of distilled water is 71.99 dyn/cm at 25 °C (77 °F).[4] (In SI units this is 71.99×10−3 N/m or 71.99 mN/m.)

## See also

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* Centimetre–gram–second system of units
* Erg

## References

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1. ^ Thomson, Sir Wl; Professor GC, Foster; Maxwell, Professor JC; Stoney, Mr GJ; Professor Flemming, Jenkin; Siemens, Dr; Bramwell, Mr FJ (September 1873). Everett, Professor (ed.). First Report of the Committee for the Selection and Nomenclature of Dynamical and Electrical Units. Forty-third Meeting of the British Association for the Advancement of Science. Bradford: Johna Murray. p. 224. Retrieved 8 April 2012.
2. ^ Gyllenbok, Jan (11 April 2018). "dyne". Encyclopaedia of Historical Metrology, Weights, and Measures. Vol. 1\. Birkhäuser. p. 90\. ISBN 9783319575988. Retrieved 20 April 2018.
3. ^ Beach, Chandler B., ed. (1914). "Dyne" . The New Student's Reference Work . Vol. II. Chicago: F. E. Compton and Co.
4. ^ Haynes, W.M.; Lide, D. R.; Bruno, T.J., eds. (2015). "Surface tension of common liquids". CRC Handbook of Chemistry and Physics (96nd ed.). CRC Press. p. 6-181. ISBN 9781482260977.

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CGS units

Base units|

* centimetre
* gram
* second

Derived non EM units|

* barye
* dyne
* erg
* gal
* kelvin
* poise
* kayser
* phot
* stilb

Derived EMU units|

* abampere (biot)
* abcoulomb
* abhenry
* abmho
* abohm
* abvolt
* gauss
* gilbert
* maxwell
* oersted

Derived ESU units|

* statampere
* statcoulomb
* statmho
* statohm
* statvolt

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