Page 5 - COMPOSITION AND PROPERTIES OF AIR

Different gases present in the

air :

1. OXYGEN:

•It is essential for the survival of living
organisms.

• It is the oxygen in the air that helps humans

and animals carry out the breathing process.

•Oxygen is also required for fire to keep

burning. If we were to keep an inverted tumbler
covering a burning candle, the candle will go

off in a few seconds because of the lack of
oxygen-containing air due to the tumbler. On
the other hand, the candle in the open

continues to burn as it receives oxygen in
sufficient amount from the air around it.

•Air contains about 21% of oxygen.