Spherical forms of rain drops is due to-

The correct answer is Surface tension.

Key Points

• 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.

Additional Information

• Surface tension: The property by virtue of which liquid tries to minimize its free surface area is called surface tension.
  • In a spherical shape, the surface area is minimum and for this reason, the raindrops are spherical.
  • Surface tension is measured as the force acting per unit length of an imaginary line drawn on the liquid surface.