A capillary tube of radius 0.50 mm is dipped vertically in a pot of water. Find the difference between the pressure of the water in the tube 5.0 cm below the surface and the atmospheric pressure. Surface tension of water = 0.075 N m-2.
190 N m-2
Given, surface tension of water,
Radius of the capillary tube,
As the liquid is water, it will concave upwards.
The pressure is given by
Pressure at a depth of 5 cm is
Let the pressure of water just below surface be P.
The difference is pressure thus becomes,