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Question

Warm air is ______ than cold air.


A
lighter
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B
denser
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C
heavier
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D
either heavier or lighter
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Solution

The correct option is A lighter
When air is heated, kinetic energy of air molecules increases and the average distance between then increases. Hence, air expands and becomes less dense than the air around it. Therefore, we can say that the warm air is lighter than cold air.

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