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,



1