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Title: Dyne  
Author: World Heritage Encyclopedia
Language: English
Subject: Centimetre–gram–second system of units, Metric system, Erg, Statcoulomb, Surface tension
Publisher: World Heritage Encyclopedia


The dyne (symbol "dyn", from Greek δύναμις, dynamis, meaning power, force) is a unit of force specified in the centimetre–gram–second system of units (CGS), a predecessor of the modern SI. One dyne is equal to 10 µN (micronewtons), or to 10 nsn (nanosthenes) in the old metre–tonne–second system of units. Equivalently, the dyne is defined as "the force required to accelerate a mass of one gram at a rate of one centimetre per second squared":

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

The dyne per centimetre is the unit traditionally used to measure surface tension. For example, the surface tension of distilled water is 72 dyn/cm at 25 °C (77 °F);[1] in SI units this is 72×10−3 N/m or 72 mN/m.


The names dyne and erg were first proposed as units of force and energy in 1861 by Joseph David Everett.[2] The natural units listed in the same text (see Farad in this reference), are those of the metre-gram-second amu.

The names were reused in 1873 by a Committee of the British Association[3] (of which Everett was reporter) that proposed using the centimetre-gram-second system for electrical and dynamical systems.


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