Derive an expression for the height to which the liquid rises in a capillary tube of rad us fl-with ang e ofcontlct9. give one example of capillarity from daily life.
The expression for the height h to which the liquid rises in a capillary tube of radius r and contact angle θ is given by:
h = (2σ cos(θ))/(rhogr)
where σ is the surface tension, rho is the density of the liquid, g is the acceleration due to gravity, and r is the radius of the capillary tube.

Example of capillarity from daily life:
a. Water being absorbed by a paper towel
b. Oil being drawn up into a wick in a kerosene lamp
c. Blood being drawn into a thin glass tube for medical testing
d. Soda being drawn up through a straw when you suck on it