Question

Angle of contact for pure water and clear glass is..

Answer 1

The angle between the tangent at the liquid surface at the point of contact and the solid surface inside the liquid is called the angle of contact for a given pair of solid and liquid. It is represented by θ.

Angle of contact depends upon the nature of the liquid and solid contact and the medium which exists above the free surface of liquid. The angle of contact does not depend on the manner of contact.

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.

Answer 2

Hii

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Angle of contact for pure water and clear glass is 0 degree.

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