Dyne
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The dyne (symbol: dyn; fromAncient Greekδύναμις(dúnamis)'power, force') 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 δύναμις ('force', 'power').
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 = 1kg⋅m/s2 = 105 g⋅cm/s2 = 105 dyn
| vte | Newtons | Dynes | Kilograms-force kiloponds | Pounds | Poundals |
|---|---|---|---|---|---|
| 1N | ≡1kg⋅m⁄s2 | =100000dyn | ≈0.10197kgf | ≈0.22481lb | ≈7.23301pdl |
| 1dyn | =1×10−5N | ≡1g⋅cm⁄s2 | ≈1.01972×10−6kgf | ≈2.24809×10−6lb | ≈7.23301×10−5pdl |
| 1kgf | =9.80665N | =980665dyn | ≡gn×1kg | ≈2.20462lb | ≈70.9316pdl |
| 1lb | ≈4.44822N | ≈444822dyn | ≈0.45359kgf | ≡gn×1lbm/.3048m⁄ft | ≈32.1740pdl |
| 1pdl | ≈0.13825N | ≈13825.5dyn | ≈0.01410kgf | ≈0.03108lbf | ≡1lbm⋅ft⁄s2 |
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). (In SI units this is 71.99×10−3N/m or 71.99mN/m.)