Question

If we take same amount of hot and cold air, in a given fixed volume of a container, then which of the following statements is correct?

• A. Hot air exerts more pressure on the walls of the container.
• B. Cold air exerts more pressure on the walls of the container.
• C. Both hot and cold air exert same pressure on the walls of the container.
• D. Pressure of hot and cold air cannot be compared.

Answer 1

The correct option is A

Hot air exerts more pressure on the walls of the container.

Hot air has more kinetic energy than cold air. We know that for a given quantity of air confined within a given space, as the temperature increases, pressure also increase.
Hence hot air will exert more pressure on the walls of the container.