Stokes' Law Calculator
Find the drag force on a small sphere in viscous fluid.
Stokes' law gives the drag on a small sphere moving slowly through a viscous fluid.
The math behind it
F = 6π·μ·r·v, valid at low Reynolds number (smooth, creeping flow).
Worked example
0.5 mm sphere at 0.02 m/s in water → about 1.88 × 10⁻⁹ N.
FAQ
Where is it used?
Settling of fine particles, the falling-ball viscometer and aerosol physics.