Latifah Aldossary Dalton’s Law of Partial Pressures 1.Select one of the Ideal Gas cylinders (to the right of the apparatus) by clicking on its white label. Click the red arrow on the brass cylinder valve until the meter reads 400. Add this Ideal Gas to the balloon by clicking the green Open Valveswitch once to add gas and again to stop. Add an amount of your choice but do not fill the balloon too full since you will be adding two additional gases. Click Return Tank2.Repeat step # 2 for two additional ideal gases of your choice (you don’t have to click on the red arrow for these additional gases though as the valve is already open). Make certain that you do not explode the balloon. If you do, click the Resetbutton located on the upper right of the gas chamber and repeat the experiment (if the Resetbutton doesn’t work you will need to restart the experiment). 3.Click on the experimental apparatus to Zoom In. There are four LCD controllers on the .