Composition of Air:
The atmosphere is the mixture of different types of gases, including water vapour and dust particles. Nitrogen and Oxygen are the two main gases of the atmosphere. 99 percent part of it is made up of these two gases. Other gases like organ, carbon dioxide, hydrogen, nion, helium etc.watch Composition of Air to learn more.
That air is a non-homogeneous mixture of different gases. There are two ways by which we can represent the composition of air: i) Percentage of gas by volume ii) Percentage of the gas by mass It is important to note that, the composition of different gases (in dry air) by mass is a fixed one whereas the percentage composition of the gases by volume or mass in wet air i.e., air containing moisture is dependent on humidity or the moisture in the air. This is because of the fact that with change in the humidity, the volume and the density of air changes, which results in the change in volume percentage.
Another important point about gases is that, if two gases of different densities are mixed, they will stay mixed forever. Further, if two gases are brought into contact with each other, they will mix by their own. This also happens (i.e. mixing of gases) when the two gases are separated by a thin porous membrane. This phenomenon of gases is called diffusion. Requirement of Sufficient Quantity of Air in Mines Air is required in mines for four important reasons namely – to supply oxygen for breathing – to remove heat from underground environment – to dilute the presence of dust and various unwanted gases – to remove dust and unwanted gases.
Useful for CBSE, ICSE, NCERT & International Students
Grade : 8
Subject : Chemistry
Lesson : Air
Topic: Composition of Air
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