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Warm Air and Cool Air

What happens ...

Question

What happens to air when it is heated?

A

Contracts

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B

Expands

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C

Moves down

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D

Movement ceases

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Solution

The correct option is B
Expands

Air expands on heating. Hot air molecules have more kinetic energy, so they have more space between them than cool air molecules. Therefore, when we heat air, it expands to allow more space for the molecules. If air is cooled, it contracts because cool air molecules have less kinetic energy.

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