You blow up an air impermeable balloon at sea level, and then hike to the peaks in the Sierra Nevadas, Denali, Mt Everest, the Alps or Mt Kilamanjaro, and you notices the balloon’ s diameter has expanded. You also know that the temperature has dropped and the air pressure decreased as you ascended the heights. Develop a hypothesis and an experiment to determine whether pressure or temperature or both are responsible for the increase in balloon size.
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