What is mean by angle of contact ? Explain why it is accute in case of water and glass and obtuse in case of mercury and glass.

What is angle between pure water and glass?

The angle of contact between glass and mercury is

The angle of contact of mercury glass surface is

For tap water and clean glass, the angle of contact is

The angle of contact at the interface of water glass is 0^@ , Ethylacohol- glass is 0^@ ,mercury glass is 140^@ and Methyliodide - glass is 30^@ . A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is

Mercury in a glass container does not wet its surface , while water in a glass container wets it.

The surface of water in contact with glass wall is

A capillary tube of radius 1 mm is immersed in a beaker of mercury. The mercury level inside the tube is found to be 0.536 cm below the level in the reservoir. Determine the angle of contact between the mercury and glass.

Two parallel glass plates are held vertically at a small separation d and dipped in a liquid of surface tension T , the angle of contact theta =0^@ and density rho . The height of water that climbs up in the gap between glass plates is given by