dyne

[From Greek dunamis, power. See dynamic.]

A unit of force in the CGS system. It is the force required to accelerate one gram by one centimeter per second squared.

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[Etymology: Gk: ‘power’] force. Symbol dyn. Metric-c.g.s. Identically gram·gal, i.e. the force that gives to a mass of 1 gram an acceleration of 1 centimetre per second squared, = 10^-5 N (2.248 089 4~ × 10^-6 lb-f) (= cm·g·s^-2 in c.g.s. base terms). The following are among the coherent derived units:

• dyn·s·cm^-2 = poise for dynamic viscosity
• dyn·cm = erg for energy, work, quantity of heat
• dyn·cm^-2 = barad for pressure
• dyn·s·cm^-3 = rayl for specific acoustic impedance
• dyn·cm^-1·s = mechanical ohm for mechanical impedance
• dyn^-1·cm·s^-1 = mohm for mechanical mobility.

As the pioneer coherent unit of force, in place of a weight, introduction of the dyne met learned opposition.
[Newton H. A. Nature Vol. 9, 312 (1874)] The name large dyne was proposed for the m.k.s. equivalent, which became the newton.

Unit of force; one dyne is required to give a mass of 1 g an acceleration of 1 cm s⁻².

The metric unit of force, being that amount which would, during each second, produce an acceleration of 1 cm per second in a particle of 1 gram mass.

To convert from dynes to:

grams, multiply by .00102.
joules/cm, multiply by .0000001.
joules/meter (newtons), multiply by .00001.
kilograms, multiply by 1.02E-06.
poundals, multiply by 7.233E-05.
pounds, multiply by 2.248E-06.

Tutor's tip: It will take more than a "dyne" (unit of energy) to "dine" (to eat any meal) on lobster.

"Dynes" redirects here. For the president of the University of California system, see Robert C. Dynes.

In physics, the dyne (symbol "dyn", from Greek δύναμις (dynamis) meaning power, force) is a unit of force specified in the centimetre-gram-second (CGS) system of units, a predecessor of the modern SI. One dyne is equal to exactly 10 µN. 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 µN

The dyne per centimetre is the unit usually associated with measuring surface tension. For example, the surface tension of distilled water is 72 dyn/cm at 25°C (77°F).^[1]

Units of force

	newton (SI unit)	dyne	kilogram-force, kilopond	pound-force	poundal
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 as used in the official definition of the kilogram-force is used here for all gravitational units.

References

1. ^ http://www.dow.com/PublishedLiterature/dh_00e5/09002f13800e5fdb.pdf?filepath=/PublishToInternet/InternetDOWCOM/surfactants/pdfs/noreg/119-01514.pdf&fromPage=BasicSearch

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Dyne

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