Question

c)Components of air.​

Answer 1

Answer:

78% nitrogen, 21% Oxygen and traces of water

Answer 2

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Explain the Components of Air

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Components of Air :-

Air is a mixture of gases. It contains oxygen that enables us to breathe and live. It contains carbon dioxide needed by plants. Some other gases present in the air are nitrogen and argon. Air also contains water vapour, dust and smoke.

♧ Nitrogen ♧

Nitrogen is the most abundant gas in the atmosphere. Air contains 78% nitrogen. Plants need nitrogen to grow. However, all plants cannot use the nitrogen from the atmosphere directly. Only some plants, such as peas and beans, can convert atmospheric nitrogen to a useful form in their roots. Other plants get nitrogen from the soil. Nitrogen is used to make fertilizers. It is also used to keep packaged foods fresh. Liquid nitrogen is very cold. It is used in laboratories, blood banks and food storage units to keep items frozen.

♧ Oxygen ♧

Air contains 21% oxygen. The presence of oxygen makes life on the Earth possible. Oxygen is also needed for burning. Let us do an activity to see this.

Note : Activity is attached

♧ Carbon dioxide ♧

Carbon dioxide is needed by all green plants to make their food. Carbon dioxide plays a major role in trapping the Sun's heat that enters the atmosphere. This maintains the required warmth on the Earth. However, burning large amounts of fossil fuels releases a lot of carbon dioxide into the atmosphere. This excess carbon dioxide in the atmosphere traps the heat from the Sun. This can raise the temperature of the Earth.

♧ Water Vapour ♧

The water from the surface of rivers, oceans and other water bodies evaporates and forms water vapour in the atmosphere. Water vapour also contributes in trapping the Sun's heat inside the atmosphere. The amount of water vapour in the atmosphere varies from place to place and from time to time.

♧ Other gases ♧

The other gases present in the atmosphere are argon, methane, nitrous ( say nie-trus ) oxide and sulphur dioxide. Smoke and dust particles are also present in the atmosphere.

Get it Right! :-

While oxygen supports burning, nitrogen controls burning. Had there been no nitrogen in the atmosphere, we would not have been able to control fire.

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