Blow out the burning candle after it has burnt for some time.Immediately bring a lighted matchstick near the smoke.What happens to stick?
What do you conclude from such an action?

Dear student,

When a candle burns combustion takes place and in the presence of air the burning candle releases carbon dioxide.
If we blow the burning candle and bring a matchstick near the smoke then as smoke contains carbon dioxide and carbon dioxide molecules are heavier than air. Because of this, they push the oxygen and other molecules in the air out ​​​​​​and when oxygen is out from the area then it will no more react with carbon and this makes the flame go out.

Regards