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 d = 0.8 gm/c.c acceleration due to gravity G = `10ms^(-2)=1000cms^(-2)`, surface tension T = 80 dynes/cm angle of contact `theta=60^(@)`, The height of liquid column in capillary tube h = `(2Tcostheta)/(RGD)` `rArrh=(2xx80xxcos60^(@))/(0.1xx1000xx0.8)=1cm`