Question

The process by which warm air goes out of a room from the top and cold air moves in from doors and windows naturally is called

• A. air circulation
• B. ventilation
• C. air rotation
• D. none of the above

Answer 1

The correct option is B

ventilation

(B): Ventilation

1. The process by which impure and warm air inside a room is continuously replaced by fresh air from outside is called ventilation.
2. The moist warm air containing carbon dioxide is light, and hence, rises up. It then passes out through the ventilators.
3. This causes a drop in pressure within the room. Thus, the cold and fresh air from doors and windows flows in.
4. This continuous circulation of air is maintained within the room by convection currents.

Hence, the correct answer is an option (B): ventilation