Question

Why rain water drops come in the earth on round shape?

Answer 1

Raindrops start to form in a roughly spherical structure due to the surface tension of water. This surface tension is the "skin" of a body of water that makes the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules.

Answer 2

Spherical shape of the water droplets is due to the surface tension phenomena

The cohesive forces between liquid molecules is responsible for the surface tension. The molecules of water on the surface don't have like molecules around it.



So the molecules​ lying in the surface are attracted or pulled downward by the adjacent water molecules. So the water droplets tend to be pulled into shape of spherical due to cohesive forces.

If other forces including gravity is missing,then droplets of all the fluids have spheical shape.

So this spherical forms are easier to form, required less surface tension,less wall tension.

More the surface tension more will be the spherical form.