A gas molecule does not move slower after it bounces off the wall of a container in accordance with the kinetic molecular theory.
Kinetic molecular theory explains the states of matter, and is based on the idea that matter is composed of tiny particles that are always in motion. This theory helps explain observable properties and behavior of solids, liquids, and gases.
However, the theory is most easily understood as it applies to gases and it is with gases that we will begin our detailed study. The theory applies specifically to a model of a gas called an ideal gas.
Gas molecules collide with one another and with the walls of the container, but these collisions are perfectly elastic i.e. they do not change the average kinetic energy of the molecules.
Therefore, the gas does not move slower when it bounces off the wall of its holding container.
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