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Heat — PHYSICS STD 7 — Question

ICSE BoardEnglish MediumSTD 7PHYSICSHeat5 Marks
Question
Why is a ventilator provided in a room?
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Answer

Ventilators and windows are provided in rooms for proper ventilation. The reason is that when we breathe out in a room, the air in the room becomes warm and impure. The warm air is less dense i.e. lighter, so it rises up and moves out through the ventilators. Then the cold fresh air comes in the room through the windows to take its place. Thus the continuous circulation of fresh air keeps the air in the room fresh.

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