|Physical quantity (s)||kinematic viscosity|
|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.
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.