Stokes (unit)

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Physical unit
Unit name Stokes
Unit symbol
Physical quantity (s) kinematic viscosity
Formula symbol
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.

Individual evidence

  1. ^ François Cardarelli: Scientific Unit Conversion. A Practical Guide to Metrication , Springer Verlag, London 1997, p. 231.
  2. Federal Law Gazette No. 174 (1973)
  3. Federal Law Gazette No. 742 (1988)