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6-12

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Part of NOVA
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Floating and Sinking: Hot Air Balloons

It makes sense that a balloon filled with a lightweight gas such as helium would float when surrounded by heavier air. But why does filling a huge balloon with hot air also make it float? This resource from NOVA offers a series of interactive activities that describes and illustrates the physics (mass, volume, density) of what happens inside hot air balloons.

Visit the program page here.

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