قانون ِ استوکس qânun-e Stokes (#)
*Fr.: loi de Stokes*
1) *Fluid mechanics*: At low velocities, the frictional force on a
spherical body moving through a fluid at constant velocity is equal to
6π*R*η*v*, where *R* is the radius of the sphere,
η the fluid → *viscosity*, and *v* the velocity.
2) *Spectroscopy*: The wavelength of → *luminescence*
excited by radiation is
always greater than that of the exciting radiation. → *Stokes*; → *law*. |