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Question

What can you say about the density of air inside a hot air balloon?

A
Either A or B
B
Density of air inside a hot air balloon is more than the density of air outside it
C
Density of air inside a hot air balloon is the same as the density of air outside it
D
Density of air inside a hot air balloon is less than the density of air outside it
Solution
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Correct option is B. Density of air inside a hot air balloon is less than the density of air outside it
Hot air is lighter that cold air because it occupies more space and is less dense. This is why hot air rises up which makes a hot air balloon float.

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