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 This page uses content from the English Wikipedia. The original article was at Dyne. The list of authors can be seen in the page history. As with the Units of Measurement Wiki, the text of Wikipedia is available under Creative Commons License see Wikia:Licensing.

The dyne (symbol "dyn", from Greek δύναμις (dynamis) meaning power, force) is a unit of force specified in the centimeter-gram-second (CGS) system of units, a predecessor of the modern SI. One dyne is equal to 10 µN (micronewtons), or to 10 nsn (nanosthenes) in the old meter-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 centimeter per second squared":

1 dyn = 1 g·cm/s2 = 10−5 kg·m/s2 = 10−5 N
1 Newton = 1 kg•m/s2 = 105 g•cm/s2 = 10 5 dyne

The dyne per centimeter 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.

v · d · e 1 N 1 dyn 1 kp 1 lbF newton(SI unit) dyne kilogram-force, kilopond pound-force poundal ≡ 1 kg·m/s² = 105 dyn ≈ 0.10197 kp ≈ 0.22481 lbF ≈ 7.2330 pdl = 10−5 N ≡ 1 g·cm/s² ≈ 1.0197×10−6 kp ≈ 2.2481×10−6 lbF ≈ 7.2330×10−5 pdl = 9.80665 N = 980665 dyn ≡ gn·(1 kg) ≈ 2.2046 lbF ≈ 70.932 pdl ≈ 4.448222 N ≈ 444822 dyn ≈ 0.45359 kp ≡ gn·(1 lb) ≈ 32.174 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 is used here for all gravitational units.

## History Edit

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