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Lighter Than Air: Why Do Balloons Float?
the weight of the helium plus the balloon fabric is lighter than the air it displaces, the balloon will float in the air. It turns out that helium is a lot lighter than air. Though the difference is not as great as that between water and air (a liter of water weighs about 1,000 grams, while a liter of air weighs about 1 gram), it is
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