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प्रश्न
How do hot air balloons float?
टिप्पणी लिखिए
उत्तर
When the 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 than the air outside of the balloon. This difference in density allows the hot-air balloon to float.
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Effect of Heat on Solid, Liquid and Gases
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