Question

The angle of contact of the waterproofing agents is generally

Answer 1

1. The angle subtended between the tangents drawn at the liquid surface and at the solid surface inside the liquid at the point of contact is called the angle of contact (θ).
2. When the wax is coated on a glass capillary tube, it becomes water-proof. The angle of contact increases and becomes obtuse.
3. Hence, the angle of contact of a waterproofing agents is generally obtuse.