Stoke or Stokes (St)
Stoke or Stokes (St) :
A CGS unit of kinematic viscosity. Kinematic viscosity is defined to be dynamic viscosity (see poise) divided by the density of the liquid; this gives a quantity which depends only on the type of the liquid, independent of its concentration or density. The quotient turns out to have units length2/time. Being a CGS unit, the stokes is therefore defined to be 1 cm2/s, equivalent to 10-4 m2/s or 0.001 076 391 ft2/s. The SI has no named unit of kinematic viscosity, requiring the use instead of m2/s. The unit, called the stokes in Britain and the stoke in the U.S., is named for a British mathematician and physicist, Sir George Gabriel Stokes (1819-1903), who described the basic principles of fluid mechanics in 1845
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