Uses of Air


 
 
Concept Explanation
 

Uses of Air

Usefulness of Air:

1. Air is required for respiration: The correct proportions of nitrogen and oxygen are required for our respiration. A normal human being requires about 250 kg to 265 kg of air a day to carry out its normal activities. During respiration, we breathe in oxygen from the air and breathe out carbon dioxide. The inhaled oxygen combines with haemoglobin of our blood to form oxyhaemoglobin. The latter acts as the oxygen-carrier to the cells of our body. In the cell, oxygen oxidizes sugar molecules to produce carbon dioxide and water, and liberates heat energy. We use this energy to perform various works.

2.  Air is required for burning of fuels: It is the oxygen of air that is essentially required for burning of things. Nothing will burn in the absence of oxygen. Fuels are mostly mixtures of hydrocarbons (compounds formed from the combination of carbon and hydrogen). When they burn in air, carbon dioxide and water vapour are produced with the release of heat energy.

Fuel + Oxygen    large rightarrow     Carbon Dioxide + Water Vapour + Energy

3. Plants require air to make their food: Plants require carbon dioxide of the air to make their food by a process called photosynthesis. In photosynthesis, green plants consume carbon dioxide and water vapour from the air and the energy of the sun to prepare sugar (food).

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Sample Questions
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Question : 1

Air moves from a region of ____________ pressure to one of _____________ pressure.

Right Option : D
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Question : 2

Consider the following statement about inhaled air and exhaled air.

  1. Exhaled air contains more carbon dioxide than inhaled air.
  2. Exhaled air is cooler than inhaled air.
  3. Inhaled air contains more moisture than exhaled air.
  4. Inhaled air contains more oxygen than exhaled air.
Right Option : D
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Question : 3

In which of the following air is used ?

Right Option : D
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