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T1 CH3 Matter Around Us — Science STD 7 — Question

Tamilnadu BoardEnglish MediumSTD 7ScienceT1 CH3 Matter Around Us2 Marks
Question
How do hot air balloons float?
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Answer

When air inside the hot air balloon is heated with a burner, it expands. The expansion causes the density of the air inside the balloon to decrease. Hence, the air inside the balloon has a lower density that the air outside of the balloon. This difference is density allows the hot-air balloon to float.

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