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If it's a normal balloon like the one you'd see at a birthday, it's because it's filled with helium which is lighter than the air around us (it's hard to imagine air has weight, but it does at a molecular level).

If you're talking about a hot air balloon, it floats because the air in the balloon is hotter than the air around it, and heat rises (again due to molecular-level activity).

Hope that helps!

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Chris Hawkins

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Q: Why do air ballons fly?
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