Define angle of contact.

The angle which the tangent make to the free surface of the liquid at the point of contact with the walls of the vessel inside the liquid is called the angle of contact, or it is defined as the angle subtended between the tangents drawn at liquid surface and at solid surface inside the liquid at the point of contact is called angle of contact (θ). Angle of contact depends upon the nature of the liquid and solid in contact and the medium which exists above the free surface of the liquid.Angle of contact increases with increase in temperature of liquid. Angle of contact decreases on adding soluble impurity to a liquid.

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