What typically happens to gas volume when pressure is decreased at a constant temperature?

When pressure is decreased at a constant temperature, gas volume increases, which is a direct application of Boyle's Law. Boyle's Law states that for a given mass of gas at constant temperature, the volume of the gas is inversely proportional to the pressure it exerts. This means that as the pressure acting on a gas decreases, the molecules have more space to move around, leading to an increase in volume.

In practical terms, if you were to reduce the pressure exerted on a gas, such as by increasing the volume of its container, the gas particles will spread out more to fill the available space. The constant temperature ensures that the average kinetic energy of the gas particles remains unchanged, meaning that any change in pressure will directly impact the volume according to this principle.

The other choices do not accurately reflect the relationship described by Boyle's Law. For example, a decrease in pressure cannot lead to a decrease or no change in gas volume at constant temperature, as that would contradict the fundamental principles of gas behavior.