A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?

Question

Accepted Answer

One fourth as that of A. Stoke's law states that settling velocity (v) is proportional to the square of the diameter (d²). Since the diameter doubles (20/10 = 2), the velocity will change by a factor of 2² / 4 = 1/4.