For proper ventilation of building, wind...

For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

more air in

cool air in near the bottom and hot air out near the roof

hot air in near the roof and cool air out near the bottom

hot air out near the roof

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The correct Answer is:

Density of hot air is lesser than the density of cold air so hot air rises up.

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