Dyne
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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/s^{2} = 10^{−5} kg·m/s^{2} = 10^{−5} N
- 1 Newton = 1 kg•m/s^{2} = 10^{5} g•cm/s^{2} = 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.
newton (SI unit) | dyne | kilogram-force, kilopond | pound-force | poundal | |
1 N | ≡ 1 kg·m/s² | = 10^{5} dyn | ≈ 0.10197 kp | ≈ 0.22481 lb_{F} | ≈ 7.2330 pdl |
1 dyn | = 10^{−5} N | ≡ 1 g·cm/s² | ≈ 1.0197×10^{−6} kp | ≈ 2.2481×10^{−6} lb_{F} | ≈ 7.2330×10^{−5} pdl |
1 kp | = 9.80665 N | = 980665 dyn | ≡ g_{n}·(1 kg) | ≈ 2.2046 lb_{F} | ≈ 70.932 pdl |
1 lb_{F} | ≈ 4.448222 N | ≈ 444822 dyn | ≈ 0.45359 kp | ≡ g_{n}·(1 lb) | ≈ 32.174 pdl |
1 pdl | ≈ 0.138255 N | ≈ 13825 dyn | ≈ 0.014098 kp | ≈ 0.031081 lb_{F} | ≡ 1 lb·ft/s² |
The value of g_{n} 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.
References Edit
- ↑ [1](dead link)
- ↑ Rossiter, William (1879). Dictionary of Scientific Terms. London and Glasgow: William Collins, Sons, and Coy. p. 109.
- ↑ Template:Cite conference