{{Infobox unit
| bgcolor =
| name = dyne
| image = Elastic hysteresis lab d 3.2 N wsulake (cropped; rotated).JPG
| caption = Ohaus spring scale displaying force measurements in both newtons and dynes
| standard = CGS units
| quantity = force
| symbol = dyn
| symbol2 =
| extralabel =
| extradata =
| units1 = CGS base units
| inunits1 = 1 g⋅cm/s2
| units2 = SI units
| inunits2 =
| units3 = British Gravitational System
| inunits3 =
}}
The dyne (symbol: dyn; ) is a derived unit of force specified in the centimetre–gram–second (CGS) system of units, a predecessor of the modern SI.
History
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, and is from Ancient Greek ('force', 'power').<ref>{{cite conference
|url= https://www.biodiversitylibrary.org/item/94452#page/7/mode/1up
|title=First Report of the Committee for the Selection and Nomenclature of Dynamical and Electrical Units
|date=September 1873
|conference= Forty-third Meeting of the British Association for the Advancement of Science
|editor-first= Professor
|editor-last = Everett
|first1=Sir Wl
|last1 = Thomson
|first2 = Foster
|last2 = Professor GC
|first3 = Professor JC
|last3 = Maxwell
|first4 = Mr GJ
|last4 = Stoney
|first5 = Jenkin
|last5 = Professor Flemming
|first6 = Dr
|last6 = Siemens
|first7 = Mr FJ
|last7 = Bramwell
|publisher= Johna Murray
|location= Bradford
|page = 224
|access-date= 8 April 2012}}</ref>
Definition
The dyne is defined as "the force required to accelerate a mass of one gram at a rate of one centimetre per second squared". 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".
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
Use
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).<ref>{{cite book | editor = Haynes, W.M. | editor2=Lide, D. R. | editor3=Bruno, T.J. | chapter = Surface tension of common liquids | title = CRC Handbook of Chemistry and Physics | edition = 96nd | publisher = CRC Press |isbn = 9781482260977 |url = https://books.google.com/books?id=RpLYCQAAQBAJ| year = 2015| page=6-181
}}</ref> (In SI units this is or .)
See also
- Centimetre–gram–second system of units
- Erg