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Hot air balloon rises up in sky because...

Hot air balloon rises up in sky because

A

Hot air is more dense than cold air.

B

Hot air is less dense than cold air.

C

volume of a gas decreases on heating

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
According to Charle.s law .volume of a gas increases on heating and its density (mass/volume) decreases.. Since hot air is less dense than cold air therefore hot air inside the balloon is lighter than cold atmospheric air.
As a result of this, hot air balloon rises up by displacing the atmospheric air.
Therefore, hot air balloon rises up in sky as hot air is less dense than cold air.
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