Which gas law suggests that if the volume of a gas is decreased at constant temperature, the pressure will increase?

Boyle's Law describes the relationship between the pressure and volume of a gas at constant temperature. This law states that when the volume of a gas decreases, the pressure increases, provided the temperature remains constant. This phenomenon occurs because reducing the volume of a gas forces the gas molecules closer together, leading to more frequent collisions with the walls of the container. As a result, the pressure exerted by the gas increases.

In contrast, Charles' Law relates the volume of a gas to its temperature at constant pressure, meaning it does not apply to changes in volume and pressure while holding temperature steady. Dalton's Law pertains to the partial pressures of gases in a mixture, which is not directly related to the pressure-volume relationship described by Boyle's Law. Henry's Law, on the other hand, deals with the solubility of gases in liquids at a given temperature, thus also not applicable to the question regarding gas volume and pressure changes. Therefore, Boyle's Law is the correct answer as it directly addresses the scenario depicted in the question.