ocr: Why is a balloon lighter than air? Balloons are lighter than air because they have giant skins, called "envelopes" that are filled with low- density hot air. The individual parts ofa balloon, such as its basket, envelope, and any passengers, are much heavier than air, and can'ti float on their own. However, when a balloon is filled with a low-density gas, it takes up a much larger volume, but becomes only a litle heavier. Overall, the balloon, basket, and passengers become lighter than the air that they displace, and so they begin to float. BALLOON FULL OF HOT AIR EMPTY BALLOON People have tri ...
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