Interfacial tension and centrifugal forces balanced at mechanical equilibrium.

Interfacial tension of any liquid that gives a shape very close to a cylinder at the equilibrium point, can be estimated using Vonnegut’s expression:

ω : angular velocity; (radians per second, degrees per second, revolutions per second)

Δ*ρ :* difference between two fluid: **the less-dense** and **the dense**