Significance Of Constitutions Of Air

NITROGEN:

It is an important constituent of living organisms. It cannot be utilized by living organisms in elemental form. The elemental nitrogen is converted into its usable compounds like nitrate by nitrogen fixation processes.

OXYGEN:

Oxygen is extremely important for the survival of organisms as organisms respire in it. Requirement of oxygen is an essential condition for burning of a substance hence it plays an important role in combustion.

CARBON DIOXIDE:

It occurs in carbohydrates, fats, proteins, nucleic acids, enzymes and hormones. Carbon dioxide molecules reflect back the heat radiations and help the earth not to radiate heat very rapidly at night. Carbon dioxide partially dissolves in water and helps in the formation of carbonate salts. These give taste to natural water. Carbon dioxide provides oxygen to the atmosphere by photosynthesis.

WATER VAPOUR:

Water vapour rise high up into the atmosphere and get cooled to form clouds. These bring rain both on land and oceans. Snow is produced in cooler regions. The vapours control the climatic conditions.

INERT GASES:

Inert or noble gases are present in air in very small amount. These do not react with any substance but can be used in many ways.

HUMAN RESPIRATION:

The air that leaves a person's lungs during exhalation contains 14% oxygen and 4.4% carbon dioxide.

Atmospheres with oxygen concentrations below 19.5 percent can have adverse physiological effects, and atmospheres with less than 16 percent oxygen can become life threatening.