The surface tension of a liquid is 80 dyne/cm. Its relative density is 0.8. If the angle of contact between the liquid and glass is 60^(@),find the height to which the liquid rises in a glass capillary tube of radius 1 mm. (Assume g=10ms^(-2))

The surface tension of a liquid is 80 dyne/cm. Its relative density is

1.	The surface tension of a liquid is 80 dyne/cm. Its relative density is 0.8. If the angle of contact between the liquid and glass is 60^(@),find the height to which the liquid rises in a glass capillary tube of radius 1 mm. (Assume g=10ms^(-2))
Answer» Solution :Radius of the capillary tube r=1 mm = 0.1 cm density `rho=0.8` gm/c.c ACCELERATION due to gravity `g=10ms^(-2)=1000CM^(-2)` surface tension S=80 dynes /cm angle fo contact `theta=60^(@)` The heightof liqudi columnin capillary tube `H=(2S cos theta)/(r t rho)impliesh=(2xx80xxcos 60^(@))/(0.1xx1000xx0.8)=1cm`