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. On smaller raindrops, the surface tension is stronger than in larger drops. The reason is the flow of air around the drop.

As the raindrop falls, it loses that rounded shape. Flattened on the bottom and with a curved dome top, raindrops are anything but the classic tear shape. The reason is due to their speed falling through the atmosphere.Even as a raindrop is falling, it will often collide with other raindrops and increase in size. Once the size of a raindrop gets too large, it will eventually break apart in the atmosphere back into smaller drops. This time, the surface tension loses and the large raindrop ceases to exist. Instead it pulls apart when it grows to around 4 millimeters or more.

Raindropstake upthe spherical shapedue tothesurface tension of water which is caused due tothetendency of water molecules to stick together.The spherical shapeis havingtheleast possible surface area due to which it can resist any oftheexternal force intheatmosphere.

क्योंकी वह अपने आकार को small रखना चाहते हैं