What describes the relationship between gas volume and temperature in ideal gas behavior?

The correct choice reflects the direct relationship between gas volume and temperature as outlined in Charles's Law. According to this law, when the pressure of a gas is held constant, the volume of the gas is directly proportional to its absolute temperature (measured in Kelvin). This means that as the temperature of the gas increases, its volume also increases, provided the pressure remains unchanged.

This principle is significant in various HVAC applications, as it helps in understanding how gases expand and contract with temperature changes. For example, in refrigeration systems, proper management of gas volumes at different temperatures is essential for efficient operation.

The other options fail to capture the accurate relationship dictated by Charles's Law. The claim that volume and temperature are inversely proportional contradicts the direct proportionality established in the law. Stating that volume is independent of temperature ignores the fundamental principles of gas behavior, while suggesting that volume changes only with pressure overlooks temperature as a key factor affecting gas volume.