If you put a helium-filled balloon in the refrigerator,
(a) Will its volume increase, decrease, or stay the same?
(b) Choose the best explanation from among the following:
I. Lowering the temperature of an ideal gas at constant pressure results in a reduced volume.
II. The same amount of gas is in the balloon; therefore, its volume remains the same.
III. The balloon can expand more in the cool air of the refrigerator, giving an increased volume?