Question

define angle of contact. on what factors does it depends​

Answer 1

The angle of contact depends upon the liquid's nature and the solid in contact and the medium which exists above the free surface of the liquid. The angle of contact increases with an increase in the temperature of the liquid. The angle of contact decreases on adding soluble impurity to a liquid.

Answer 2

Answer:

The angle of contact is the angle made by the tangent to the liquid surface at the point of contact with the solid surface inside the liquid.

The contact angle depends upon the medium above the free surface of the liquid, and the nature of the liquid and solid in contact.