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Question

Hot air balloon rises up in the air because:

A
hot air is heavier than cold air
B
Hot air is lighter than cold air
C
Hot air contains water vapors which push the balloon up
D
None of the above
Solution
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Correct option is B. Hot air is lighter than cold air
Hot air rises up because it is lighter than cold air. As the air inside the balloon is hotter than the air surrounding the balloon it rises up.

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