In all cases it is propor
In all cases it is proportional to the radius of the solid object and the viscosity of the fluid. The Stokes version of it is used to account for the density of the surrounding fluid, giving this quantity either a plus or minus sign, and in the general case of a small sphere in drag-limited fall, it is given by the force of gravity over the quantity six pi times the radius times the viscosity. FTP name this quantity, the maximum theoretical rate of descent of a body acted upon only by gravity and viscous drag.
In all cases it is proportional to the radius of the solid object and the viscosity of the fluid.