Answer:
a) When air inside the tires gets colder, it shrinks, so the tires seem flat, even though they haven't lost any air.
b) When the air inside the soda can gets hot, the molecules of gas move faster, exerting more and more and more pressure, eventually exploding the soda can.
c) When the nalgene is cooled, the air pressure inside will lower; the volume of the nalgene will stay the same, though, because the nalgene is a rigid container.
