What is said about the volume of a gas in relation to its absolute temperature according to Charles' Law?

According to Charles' Law, the volume of a gas is directly proportional to its absolute temperature, provided that the pressure remains constant. This means that if you increase the temperature of a gas, the volume increases as well, and conversely, if the temperature decreases, the volume will decrease proportionally.

This relationship arises because an increase in temperature causes the molecules of the gas to gain kinetic energy, moving more rapidly and pushing against the walls of their container, which results in an increase in volume. The law is typically expressed mathematically as V/T = k, where V is the volume, T is the absolute temperature in Kelvin, and k is a constant for a given quantity of gas.

Understanding this direct proportionality is crucial in practical applications, such as in the design of gas-filled systems where temperature changes can greatly affect performance and safety.