The transfer of heat by molecular collision is smallest in

Solution (By Examveda Team)

The correct answer is (C) Gases.

Let's break down why:

Heat transfer by molecular collision refers to how heat energy moves through a substance because its molecules bump into each other.

* Solids: In solids, molecules are packed very closely together. This means collisions happen frequently and efficiently. Think of it like a tightly packed crowd where people can easily bump into each other and pass something along. So, solids are usually good conductors of heat via collision.

* Liquids: Liquids have molecules that are closer than gases, but not as close as solids. Collisions happen more often than in gases, making them better conductors than gases but not as good as solids.

* Gases: In gases, the molecules are very far apart and move randomly. This means collisions are infrequent. Because of the large spaces between molecules, energy transfer by collision is the least effective in gases.

In Summary:
The smallest heat transfer by molecular collision occurs in gases because their molecules are the most spread out.