Which of the following laws involves the relationship between volume and temperature of a gas at constant pressure?

Charles's Law establishes a direct relationship between the volume and temperature of a gas when pressure is held constant. This law states that as the temperature of a gas increases, the volume also increases, provided the pressure remains unchanged. This relationship is often expressed mathematically as V/T = k, where V is the volume, T is the temperature in Kelvin, and k is a constant.

In real-world terms, this can be observed when heating a balloon. As the air inside the balloon heats up, it expands, causing the balloon to increase in size. This fundamental behavior of gases is crucial in understanding gas laws and thermodynamics, illustrating how temperature and volume are interlinked under constant pressure conditions.

The other laws mentioned pertain to different relationships involving gases, such as pressure-volume relationships or the amount of gas, which do not directly relate volume to temperature at constant pressure as Charles's Law does.