Stokes' law

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Stokes' law

[′stōks ‚lȯ]
(fluid mechanics)
At low velocities, the frictional force on a spherical body moving through a fluid at constant velocity is equal to 6π times the product of the velocity, the fluid viscosity, and the radius of the sphere.
(spectroscopy)
The wavelength of luminescence excited by radiation is always greater than that of the exciting radiation.
References in periodicals archive ?
Sedimentation methods are based on Stoke's law, which describes how rapidly particles will fall through a viscous solution like water; sand particles will fall fastest and clay particles will fall slowest.
At this point, settlement is defined by Stoke's Law and the settling of drilled particles is governed by particle size and the effective viscosity of the drilling fluid.
Though glass capillary tubes are more precise than other viscometers, such as rotating cylinders and viscometers that use Stoke's Law, glass capillary viscometers are not as quick or efficient in measurement.