Question

State whether the following statement is True or False.

Warm air is lighter than cool air.

• A. True
• B. False

Answer 1

The correct option is A True

1. Whenever air warms up, it expands.
2. This happens because the air particles have more heat energy which increases the distance between the molecules.
3. The expansion of the air lowers down its density.
4. Hence, it becomes lighter.
5. The kinetic energy of the particles and their temperature are related as $KE=\frac{3}{2}RT$
6. Where $KE$ is the kinetic energy, $R$ is the universal gas constant, and $T$ is the temperature.

Therefore, the given statement is true.