Question

Explain collision of gas molecules are perfectly elastic.

Answer 1

An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions. ... Some collisions between atoms in gases are examples of perfectly elastic collisions

Answer 2

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Collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved. Collisions are not “sticky". The average kinetic energy of the gas molecules is directly proportional to the absolute temperature.