Question

surface that is at an angle of less than 90 degree​

Answer 1

Answer:

The surface that is at an angle of less than 90° is considered to be favourable/suitable for wetting.

Wettability is the property such that a liquid maintains contact with the surface of a solid. It often depends on the contact angle. Whenever it is greater than 90°, the surface is not favourable for wetting.

This contact is maintained by intermolecular forces acting between the two surfaces.