Question

What does expansion of gases mean?

Answer 1

Expansion of gases mean that the volume occupied by them has increased due to increase in temperature. When heat is applied to a body, the kinetic energy, rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the body, i.e., its volume, increases. The amount of expansion in gases is higher than liquids and solids, since the inter molecular force of attraction is low for gases than solids or liquids. This separation between the molecules can be increased further with the increase in temperature of the gas.