What does Charles' Law describe about the pressure of a gas at constant volume when temperature changes?

Charles' Law states that the volume of a gas is directly proportional to its absolute temperature when pressure is held constant. However, when discussing the relationship of pressure to temperature at constant volume, it’s important to note that temperature and pressure will also have a direct relationship as they are related to the kinetic energy of the gas particles.

As the temperature of a gas increases, the kinetic energy of its particles also increases, leading to more frequent collisions with the walls of the container, resulting in an increase in pressure. Conversely, if the temperature decreases, the kinetic energy of the particles decreases, causing fewer collisions with the walls, and thus the pressure decreases. This aligns with the behavior of gases and provides a clear understanding of the relationship described in the question.

Hence, the statement that pressure decreases with temperature decrease accurately reflects the principles of gas behavior as described by Charles' Law under conditions of constant volume.