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

The figure shows a soap film in which a closed elastic thread is lying. The film inside the thread is pricked. Now, the sliding wire is moved out so that the surface area increases. The radius of the circle formed by elastic thread will,

The surface tension of water is $7\times {10}^{-2} \mathrm{N} {\mathrm{m}}^{-1}$. The work required to break a drop of water of radius $0.5 \mathrm{cm}$ into identical drops, each of radius $1 \mathrm{mm}$ is