Question

Tabulate the various components of air, including the components with variable composition.

Answer 1

Components of air	% By volume
1. Main components Nitrogen Oxygen	78 - 79% 21%
2. Other components Carbon dioxide Water vapour	0.02 - 0.03% Variable
3. Rare gases Argon, helium, radon, krypton, xenon, neon	Less than 1%
4. Impurities Carbon monoxide, sulphur dioxide, oxides of nitrogen, hydrogen sulphide, dust particles.	Variable

Variation in composition of air:

1. At high altitudes— The amount of oxygen is
   Less – at high altitudes.
   More – on the lower plains.
2. In deep seas — The amount of oxygen is-
   Less – in deep seas and hence divers carry oxygen cylinders.
3. In industrial areas — The amount of impurities is-
   More – in industrial and congested areas.