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How does a hot-air balloon rise?
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A gas burner supplied with gas from bottles in the balloon's basket heats the air inside the balloon. As the air warms up, it expands. The thinner air inside the balloon is lighter than the surrounding air, so the balloon floats upward.
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Previous:
Back
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Book:
Best Ever Q&A
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Section:
Science & Technology
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Chapter:
Heat & Light
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