Question

Obtain an expression for the rise and fall of liquid in a capillary tube using force

method.​

Answer 1

W = ρ (πD²/4) h g --(1)

W = ρ (πD²/4) h g --(1)The surface on the top liquid inside the capillary tube has a trough (cup) like shape. Assume the angle of contact with the walls be Ф. Surface tension is the contact force per unit length along the circumference of top surface. This force pulls the liquid vertically upwards.

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