ABSTRACT
B Capillary Forces Next we derive the simplest expression for the capillary force Fcap between a sphere of radius r and a flat surface separated by a distance D bound by a water meniscus with principal radii r1 and r2 describing the curvature κ through 1/κ = 1/r1 + 1/r2 and exhibiting the same contact angle θc, as schematized in Figure B.1. A more detailed general analysis can be found in Israelachvili (2011).
