Gizmo Warm-up The Ideal Gas Law Gizmo shows molecules moving within a chamber fitted with a movable piston. As the piston moves up and down, the volume of the chamber changes. Since gases expand to fill their container, any changes in the volume of the chamber changes the volume of the gas within. 1. Next to Dependent variable, check that Volume is selected. Using the green slider, change the pressure. Note what happens to the temperature, volume, and amount of gas. What changes