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Why Do Hot Air Balloons Rise? | RapidSmartFacts

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Created November 25, 2025

About this video

Ever wondered why hot air balloons rise? Unlock the secret of air density & buoyant force in this quick physics explanation from RapidSmartFacts. Created wit...

https://www.revid.ai/view/untitled-29WCZUUB9PAvZ4gsxYc2

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Video Transcript

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Ever wonder why hot air balloons float into the sky? The secret comes

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down to how warm air behaves. Air expands when it’s heated. As it expands,

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it becomes less dense meaning the air inside the balloon gets lighter. The colder outside

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air is heavier, so it pushes upward on the lighter air inside the balloon.

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That upward push is called buoyant force. The burner below the balloon heats

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the air, keeping it lighter than the surrounding air. The hotter the

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air gets, the stronger the lift becomes. To go down, the pilot simply

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lets the air cool or vents warm air out the top. That’s why balloons

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