Stokes Law:
Fall or Settling Velocity:

Acceleration of Gravity:

Particle Diameter:

Density of Medium:

Particle Density:

Viscosity of Medium:

where,
V
t = Fall or Settling Velocity,
g = Acceleration of Gravity,
d = Particle Diameter,
ρ
m = Density of Medium,
ρ
p = Particle Density,
µ = Viscosity of Medium.