Rooms are fitted with ventilators to let hot air out. Choose the correct phenomenon.

Conduction

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Convection

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Radiation

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Condensation

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Solution

The correct option is B
Convection

The phenomenon of convection is involved. Human beings give out carbon dioxide which increases the $C O_{2}$ level in the room. that makes the air warmer. The moist, warm air containing carbon dioxide becomes lighter, and hence, rises up. This air then passes out through ventilators which causes a drop in pressure within the room. Thus, the cold and fresh air from outside enter in through the doors and windows. This continuous circulation of air is maintained within the room by the phenomenon of convection.

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