Question

Define angle of contact.

Answer 1

Angle of contact:

1. It is defined as the angle subtended between the tangents drawn at the liquid surface and the solid surface inside the liquid at the point of contact .
2. The angle of contact is determined by the nature of the liquid, the solid with which it comes into contact, and the medium that exists above the liquid's free surface.
3. The angle of contact increases as the temperature of the liquid rises.
4. When soluble impurities are added to a liquid, the angle of contact decreases.