‘The air we breathe is made up of lots of other things besides oxyge

1.	‘The air we breathe is made up of lots of other things besides oxygen’. Identify the broad composition of dry air.Or ‘Clouds are an important part of Earth's weather’. Explain the statement.
Answer» Air is a mechanical mixture of a variety of gases. The main constituents of this mixture are nitrogen and oxygen, accounting for almost 99% of the whole, with roughly three parts of nitrogen to one part of oxygen. There are small amounts or traces of other gases. The percentage of composition of dry air by volume is in the proportions as under: - Nitrogen - 78.09 % Oxygen - 20.95 % Argon - 0.93 % Carbon dioxide - 0.03 % OR The clouds may be defined as a visible aggregate of minute particles of water in the free air. Ice or clouds both are formed by the cooling of masses of damp air, generated by upward motion and its accompanying expansion with a fall of pressure.

‘The air we breathe is made up of lots of other things besides oxygen’. Identify the broad composition of dry air.Or ‘Clouds are an important part of Earth's weather’. Explain the statement.

Answer»

Air is a mechanical mixture of a variety of gases. The main constituents of this mixture are nitrogen and oxygen, accounting for almost 99% of the whole, with roughly three parts of nitrogen to one part of oxygen. There are small amounts or traces of other gases.

The percentage of composition of dry air by volume is in the proportions as under: -

Nitrogen - 78.09 %

Oxygen - 20.95 %

Argon - 0.93 %

Carbon dioxide - 0.03 %

The clouds may be defined as a visible aggregate of minute particles of water in the free air. Ice or clouds both are formed by the cooling of masses of damp air, generated by upward motion and its accompanying expansion with a fall of pressure.

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