Question

Capillarity fall is reduced if we take the appartus (capillary tube immersed in fluid having acute angle of contact) considerable distance inside the earth( i.e below the earth crust).

(a) True

(b) False

The question was posed to me at a job interview.

This interesting question is from Surface Tension, Capillarity, Vapour Pressure and Cavitation in portion Properties of Fluids of Fluid Mechanics

Answer 1

The correct answer is (a) True

The best explanation: Capillary rise is given by

                    h=4*cosθ*σ/ρ*g*d

Inside the earth, g (acceleration due to gravity) decreases. Hence, capillary                             rise will increase compared to that on the earth’s surface.