Question

what is angle of connect for Mercury and water​

Answer 1

When a liquid has concave meniscus, the angle of contact is acute. When it has a convex meniscus, the angle of contact is obtuse.

For pure water and perfectly clean glass, the angle of contact is 0°. For ordinary water and glass, it lies between 8° and 18°. For pure water and pure silver, the angle of contact is 90°. When pure water is put in pure silver vessel, the surface of water is flat.

The angle of contact of water with greased glass surface may be obtuse. The angle of contact of water with chromium may be as high as 160°. The angle of contact of mercury (exposed to air) with lass glass is nearly 138°.