https://doi.org/10.1351/goldbook.S06028
F=6 π η r ν, where F is the force exerted on a sphere of radius r which is moving through a fluid of
viscosity
η with a relative velocity ν; this equation holds at low velocities which are free from turbulence (called the
stokes
region).
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2216 [Terms] [Paper]