Free surface of a liquid behaves like a stretched membrane and tends to assume smallest possible area due to

A liquid film at the surface behaves as a

In case of a liquid which does not wet a solid surface, the force of adhesion

Surface tension is due to

A mercury drop continues to be spherical inside the water which proves that as compared to the adhesive force between water and mercury molecules, the cohesive forces between mercury molecules are

Molecular forces are

Coatings used on raincoat are waterproof because