Stokes's law

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Stokes's law

An approximate relation, valid at low Reynolds numbers, for the drag force on a sphere moving relative to a fluid.

According to this law the drag on a sphere of radius a with speed v in a fluid with dynamic viscosity μ is
ams2001glos-Se71
Stokes's law is a good approximation for the drag on cloud droplets falling in air, but not on raindrops.

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