What is the effect of temperature on gas volume as indicated by Charles's law?

Charles's Law states that the volume of a gas is directly proportional to its absolute temperature when the pressure remains constant. This means that as the temperature of a gas increases, its volume also increases. Conversely, if the temperature decreases, the volume of the gas also decreases. This relationship is due to the increased kinetic energy of gas molecules at higher temperatures, causing them to move more vigorously and occupy more space.

The correct choice reflects this principle, illustrating how gas expands when heated. Thus, Charles's Law emphasizes the direct connection between temperature and volume, confirming that an increase in temperature will lead to an increase in volume, as long as the pressure does not change. This fundamental concept is critical for understanding the behavior of gases in various physical scenarios.