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Byju's Answer
Standard VII
Physics
Density of Hot and Cold Air
When hot air ...
Question

When hot air rises up, the number of air particles in the region:


A

Decreases

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B

Increases

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C

Remains the same

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D

Becomes zero

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Solution

The correct option is A

Decreases


Hot air being lighter rises up thereby decreasing the number of air particles in the region. So a region, deficient of air molecules i.e. a low pressure region is created below.

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