It was derived by George Gabriel Stokes in 1851 by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations. In fluid dynamics, Stokes' law is an empirical law for the frictional force – also called drag force – exerted on spherical objects with very small Reynolds numbers in a viscous fluid. The dynamic viscosities of liquids are typically several orders of magnitude higher than dynamic viscosities of gases. The units of dynamic viscosity are: P a / s rm Pa/s Pa/s, N / (m ² s) rm N/(m² cdot s) N/ (m ² s) or k g / (m s. We generally distinguish two types of viscosity: Dynamic viscosity mu is a quantity that measures the force needed to overcome internal friction in a fluid. ![]() Not to be confused with Stokes' theorem in vector calculus, or Stokes shift in luminescence and Raman spectroscopy. The Reynolds number formula depends on viscosity. The dynamic viscosities of liquids are typically several orders of magnitude higher than dynamic viscosities of gases.
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