Question

Rooms are fitted with ventilators to let hot air out. What is the phenomenon involved in the above?

• A. Conduction
• B. Convection
• C. Radiation
• D. Condensation

Answer 1

The correct option is B

Convection

The phenomenon of convection is involved. Human beings breathe out carbon dioxide which increases the $C{O}_2$ 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.