Stokes' law

During sedimentation, the particle is exposed to gravity (F g = mg = V ρ particle g) and buoyancy force according to Archimedes' law (F vz = V ρ liquid g). When the density of the particle is greater than the density of the liquid, the particle begins to sink.

Its movement is opposed by a resistance force, given by the Stokes relation:


 * $$ F_{resistance} = 6 \cdot \pi \cdot \eta \cdot r \cdot v $$,
 * where r = radius of the particle, η = dynamic viscosity of the medium, v = velocity of the particle.

Related articles

 * Viscosity measurement