Which phenomenon is responsible for spherical shape of liquid drops?

Answer:

Surface tension is responsible for the shape of liquid droplets.

Surface tension

Surface tension is the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.

• Surface tension is determined by the forces of attraction between particles within a liquid, as well as the forces of attraction of solids, liquids, and gases in contact with it.
• The work or energy needed to remove the surface layer of molecules in a unit area is approximately equal to the energy responsible for the phenomenon of surface tension.
• Surface tension is usually expressed in dynes/cm, which is the force needed to break a 1 cm film.