Question

what is capillarity derive an expression for the capillary rise of liquid in a tube

Answer 1

Capillarity is a physical phenomenon in which liquids flow without the help of gravity. Liquids even rise to a height against gravity, through narrow tubes. Capillary action is due to the phenomenon of Surface tension of liquid as well as adhesive forces between liquid molecules and molecules of the narrow tube.

Answer 2

2T cos(theta)/r=p *g*h