Final answer:
Gases participate in elastic collisions where no net energy is lost and can continue indefinitely. The kinetic energy of gas molecules is proportional to their temperature in kelvins.
Step-by-step explanation:
Gases consist of tiny particles of matter that are in constant motion, and these particles make frequent collisions. When we consider the collisions between gas particles and the walls of their container, we describe these as elastic. Elastic collisions are those in which no net energy is lost and the collisions can continue indefinitely. This property of gases can be contrasted with inelastic collisions, where the internal kinetic energy is not conserved and the objects may stick together after colliding.
The average kinetic energy of the gas molecules is also proportional to the kelvin temperature of the gas. Hence, higher temperatures correspond to higher kinetic energy in the gas particles.