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Factors Affecting Atmospheric Pressure

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on 26 May 2014

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Transcript of Factors Affecting Atmospheric Pressure

Factors Affecting Atmospheric Pressure
1. Altitude - The height of an object or point in relation to sea level or ground level.

2. Temperature - The degree of hotness or coldness of a body or environment.

The pressure exerted by
atmosphere decreases with height or altitude.
The decrease in pressure is about l cm of
mercury for every 110 m of ascent. The
atmospheric pressure is highest at sea level.
This is because at higher altitudes the air is
thinner or less dense than the air at the sea
level.

Altitude
Atmospheric pressure decreases with increase in temperature. This is because when the
temperature rises, air expands. The molecules of air move far apart (become less dense)
and hence exert less pressure. On the contrary, with decrease in temperature the air gets
compressed and the space between molecules decreases (becomes more dense) and exerts
more pressure on the region.

Temperature
MEASURING AIR PRESSURE
Atmospheric pressure is measured with the help of a
barometer. The most commonly used barometers are
the mercury barometer, aneroid barometer and
barographs. The unit of measurement is in the
millibar
The variation in temperature over the surface of the earth is due to its shape. Different regions
on the earth receive different amount of insolation resulting in variation in temperature over
different regions. This unequal heating of the earth and its atmosphere, and the rotation of the
earth are the two main factors which are responsible for the formation of pressure belts of the
world.

1. Equatorial Low Pressure Belt (Doldrums)
2. Sub-tropical High Pressure Belt
3. Sub-polar Low Pressure Belt
4. Polar High Pressure Belt
Pressure Belts
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