Earth’s Atmosphere Vertical Distribution of Air Pressure


Earth’s Atmosphere Vertical Distribution of Air Pressure:

Air is a mixture of various gases. It is highly compressible.

As it compresses, its density increases. 

The higher the density of air, the greater is the air pressure and vice versa.

The mass of air above in the column of air compresses the air under it hence its lower layers are denser than the upper layers; As a result, the lower layers of the atmosphere have higher density, hence, exert more pressure.

Conversely, the higher layers are less compressed and, hence, they have low density and low pressure.

The columnar distribution of atmospheric pressure is known as the vertical distribution of pressure.

Air pressure decreases with an increase in altitude but it does not always decrease at the same rate.

Dense components of the atmosphere are found in its lowest parts near the mean sea level.

The temperature of the air, the amount of water vapor present in the air and gravitational pull of the earth determine the air pressure of a given place and at a given time.

Since these factors are variable with a change in height, there is a variation in the rate of decrease in air pressure with an increase in altitude.

The normal rate of decrease in air pressure is 34 millibars per every 300 meters increase in altitude.

The effects of low pressure are more clearly experienced by the people living in the hilly areas as compared to those who live in plains.

Breathing problems such as faintness and nose bleeding are also faced by many trekkers from outside in such areas because of low-pressure conditions in which the air is thin and it has a low amount of oxygen content.

 

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