Advertisements
Advertisements
Question
Why is a ventilator provided in a room?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Write true or false for a given statement.
All solids expand by the same amount when heated to the same rise in temperature.
Write true or false for a given statement.
Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
Write true or false for a given statement.
Solids expand the least and gases expand the most on being heated.
Write true or false for a given statement.
Water is a bad conductor of heat.
Fill in the blank
Metals are _______ of heat.
Name two substances which expand on heating.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
Why is a tea kettle provided with an ebonite handle?
Why are quilts filled with fluffy cotton?
Explain the following effects of heat.
Expansion
