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=1mm=0.1cm` density `rho=0.8gm//c.c` acceleration DUE to GRAVITY `g=10ms^(-2)=1000cms^(-2)` surface tension `S=80` dynes/cm ANGLE of contact `theta=60^(@)` The HEIGHT of liquid column in capillary tube `h=(2Scostheta)/(rgrho)impliesh=(2xx80xxcos60^(@))/(0.1xx1000xx0.8)=1cm`