This episode on kinetic molecular theory (KMT) explains gas behavior through five fundamental postulates. These are: gas molecules are in constant, random motion; they have negligible volume; there are no intermolecular forces between them; all collisions are perfectly elastic; and their average kinetic energy is directly proportional to absolute temperature. This framework helps explain gas laws by showing that pressure results from molecular collisions and that changes in temperature alter molecular speed. The episode notes that while KMT is a model for ideal gases, it helps us understand real gases by highlighting where assumptions break down, such as at high pressures or low temperatures. In essence, the theory connects the invisible world of molecular motion to the observable properties of gases.

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