The Air in Nature. 

We all know about the importance of air. Actually from the birth to death we are sunk in the air-sea. So it?s really needed to know about it.

Let's know first the basic components of air. It contains the most important gases for our life. The major portion of air is formed by the inert gas call Nitrogen (N₂). And it is more than 78% of the air. It is called inert as it is not reactive to all chemicals. It needs 945 Kcal to break the bonds between nitrogen for one mole, which is really quite high energy to provide. Now a question may rise "Why N₂ is the major portion of the air"? it will be answered al the last of the article.

Now come to the 2^nd highest portion of air. Yes it is the most known gas to us. Oxygen (O₂) is ranked the 2^nd position. It contains about 21% of the total air. This gas is not must only for out respiration rather for the total living organisms. Without this gas energy production was just impossible. Because when we need energy (actually every time) it is needed to synthesis the ATP (Adenosine tri-phosphate) which is called the "Unit of Energy". And for the synthesis of ATP oxidation of food (especially glucose) is needed. And the main oxidizing agent is the gas Oxygen.
And then the 3^rd position, its Argon (Ar). This contains about 1% of total air. Argon is a noble gas and totally inert in nature. And then the remaining portion of air contains the carbon di-oxide, Hydrogen, Neon, and etc.
Now let's have a how and why the air circulates throughout the world? Air is basically circulated through the troposphere. As we know our total atmosphere contains five layers and they are "Exosphere" which ranges 700 to 10,000 km then "Thermosphere" having the range of 80 to 700 km and 3^rd one is "Mesosphere" which have the 50 to 80 km range and the 4^th layer is "Stratosphere" with 12 to 50 km and at last comes the "Troposphere", our nearest layer of the atmosphere which have the range of 0 to 12 km. Now come to the main topic, air mainly circulate for the rotation of the earth and circulation is badly needed to proper distribution of the heat throughout the entire earth.
Now come to the previous answer, why nitrogen is the major gas in the air? As we mentioned before Nitrogen is quite inert and not soluble in water like the other reactive gases. So when it is large in amount it reduces the chance to react the reactive gases Oxygen and Hydrogen to do reaction and stop forming unnecessary water in the atmosphere. And another reason can be like that most of the living organism's last waste product and dead body gives the nitrogen to the atmosphere. So it is simple to get the amount larger than the other gases in the air.