For a drop of radius r, the pressure from surface tension is
(Frohn and Roth 2000, p. 4).
The velocity at which a spherical droplet of density and dynamic viscosity will sink in a medium of density and dynamic viscosity is
where g is the gravitational acceleration (Lamb 1945, p. 601).
Bubble, Laplace Length, Stokes Velocity
References
Frohn, A. and Roth, N. Dynamics of Droplets. Berlin: Springer-Verlag, 2000.
Lamb, S. H. Hydrodynamics, 6th ed. New York: Dover, p. 601, 1945.
Varchenko, A. N. and Etingof, P. I. Why the Boundary of a Round Drop Becomes a Curve of Order Four. Providence, RI: Amer. Math. Soc., 1992.
