Why does a Balloon Float in Air?

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A balloon is filled up with a gas, usually hydrogen, that is lighter than air. The hydrogen in the balloon does have some weight, but the density of hydrogen is lower than that of air. This means that a balloon weighs less when filled with hydrogen in comparison to a balloon filled with the same amount of air. Since the balloon is lighter than air, it rises up into the air. If the balloon is filled with the air, the air inside is neither heavier not lighter, but the rubber of balloon makes it heavier than air and it sinks.

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