Stokes' Law

Stokes' law, abbreviated as St, is the force that is put on a small sphere, slowing down the movement through a viscous fluid.

 

Stokes' law formula
\(\large{ F =  6 \; \pi \; r \; n \; v   }\)
Symbol	English	Metric
\(\large{ F }\) = force	\(\large{ lbf }\)	\(\large{N}\)
\(\large{ \pi }\) = Pi	\(\large{3.141 592 653 ...}\)
\(\large{ r }\) = radius of sphere	\(\large{ ft }\)	\(\large{ m }\)
\(\large{ v }\) = velocity	\(\large{\frac{ft}{sec}}\)	\(\large{\frac{m}{s}}\)
\(\large{ n }\) = viscosity	\(\large{\frac{lbf-sec}{ft^2}}\)	\(\large{\frac{m}{s}}\)