Which law states that gas volume is directly proportionate to absolute temperature?

The law that states that gas volume is directly proportional to its absolute temperature is Charles's Law. This relationship can be observed mathematically as ( V \propto T ) when pressure is held constant. In simpler terms, as the temperature of a gas increases, its volume also increases, provided the pressure does not change.

This principle arises from the kinetic molecular theory of gases, which explains that when the temperature of a gas rises, the kinetic energy of the gas molecules increases, causing them to move more vigorously. As a result, the molecules spread out more, leading to an increase in volume.

Charles's Law is crucial in understanding how gases behave under various temperature conditions and is often illustrated with experiments, such as the inflation and deflation of balloons when exposed to heat or cold. It sets the foundation for further explorations and applications in thermodynamics and physical chemistry, making it a fundamental concept in gas laws.