Stokes (unit)
Physical unit | |
---|---|
Unit name | Stokes |
Unit symbol | |
Physical quantity (s) | kinematic viscosity |
Formula symbol | |
dimension | |
system | CGS system of units |
In SI units | |
In CGS units | |
Named after | George Gabriel Stokes |
Derived from | Centimeter , second |
Stokes ( St ) is the name of the unit cm² / s of the kinematic viscosity in the CGS system of units ; it is named after the Irish mathematician and physicist George Gabriel Stokes . Between 1920 and 1940 the unit was also known as the Lentor .
In business transactions in Germany, the SI unit m² / s has been mandatory since 1978 . In practice, the specification in cSt (centistokes) is common.
Conversion:
The Stokes was declared a legal measure in Austria under the name Stok by federal law of July 5, 1950; In 1973 the name was changed to Stokes; since 1988 it is no longer a legal entity.
The unit name Stok was also recommended in the German standard DIN 1342 "Toughness" from August 1936.
Individual evidence
- ^ François Cardarelli: Scientific Unit Conversion. A Practical Guide to Metrication , Springer Verlag, London 1997, p. 231.
- ↑ Federal Law Gazette No. 174 (1973)
- ↑ Federal Law Gazette No. 742 (1988)