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IF YOU PLACE AN INFLATED BALLOON IN THE FREEZER IT WILL SHRINK, OR GET SMALLER BECAUSE THE AIR MOLECULES HAVE LITTLE ENERGY; IF YOU PLACE THE BALLOON IN A BOWL OF HOT WATER, THE BALLOON WILL EXPAND, BECAUSE THE AIR HAS MORE ENERGY.
How do we know that hot air rises and cold air sinks? Use an example from our labs or your research.