All Problems

Liquids. Capillary effects

Problem 2.172

A water drop falls in air with a uniform velocity. Find the difference between the curvature radii of the drop's surface at the upper and lower points of the drop separated by the distance \(h=2.3 \mathrm{~mm}\)

Reveal Answer
R2R11/8ρgh3/α=0.20 mmR_{2}-R_{1} \approx 1 / 8 \rho g h^{3} / \alpha=0.20 \mathrm{~mm}