Question

water. rain comes down, it comes in round shape. why.what is the reason.

Answer 1

Hey mate here is your answer:-
This article teaches how a drop of rain changes shape as it falls through the atmosphere. High in the atmosphere , water collects on dust and smoke particles in clouds. Raindrops start to form in a roughly spherical structure due to the surface tension of water. ... The reason is the flow of air around the drop.
Hope it will help....

Answer 2

While the water drops are spherical in nature because of surface tension, rain drops are neighter sperical nor 'teary shaped' as believed by many of us, and also shown in cartoons. In actual observation, it looks like the top half of the hambrger bun because of the compound interaction of the various phenomena such as cohesion, surface tension, air resistance and gravity.