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Unit systemCGS units
Unit ofForce
CGS base units1 g?cm/s2
SI units
British Gravitational System2.248089×10-6 lbf

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


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]


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
(SI unit)
dyne kilogram-force,
pound-force poundal
1 N ? 1kg?m/s2 = 105dyn ? 0.10197kp ? 0.22481lbf ? 7.2330pdl
1dyn =10-5N ?1g?cm/s2 ?kp ?lbf ?pdl
1kp =9.80665N =980665dyn ?gn×1kg ?2.2046lbf ?70.932pdl
1 lbf ?4.448222N ?444822dyn ?0.45359kp ?gn×1lb ?32.174pdl
1pdl ?0.138255N ?13825dyn ?0.014098kp ?0.031081lbf ?1lb?ft/s2
The value of gn as used in the official definition of the kilogram-force is used here for all gravitational units.


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 or .)

See also


  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 2012.
  2. ^ Gyllenbok, Jan. "dyne". Encyclopaedia of Historical Metrology, Weights, and Measures, Volume 1. Birkhäuser. p. 90. ISBN 9783319575988. Retrieved 2018.
  3. ^ "Dyne". The New Student's Reference Work. Chicago: Compton. 1914.
  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.

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



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