what are the factor affecting atmospheric pressure
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Answer:
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Explanation:
Factors Affecting Atmospheric Pressure:
1. Temperature:
As the temperature increases, air expands because of which its density decreases which results in low pressure. On the other hand air shrinks due to low temperature because of which its density increases which creates high pressure.
2. Height from Sea Level:
Air pressure is created due to weight of air therefore sea level has highest air pressure. As we move upward from sea level leaving behind the heavy gases at lower layers of atmosphere, air pressure decreases because the upper air is light and its density is low.
3. Moisture in Air (Humidity):
Conversion of water from liquid state to gaseous state because of evaporation is known as atmospheric humidity. Water vapours are light in weight therefore they rise up and pressure of humid air decreases as compared to dry air. Amount of water vapours changes with time and place and because of this the pressure of air also varies.
4. Gravitation of Earth:
Atmosphere glues around the Earth due to its gravitation. The intensity of gravitational pull decreases as we get away from core of Earth. Another fact is that as Earth rotates round its axis, average distance of Polar Regions and equatorial regions varies from the core of Earth. For example Polar Regions are nearer to core of the Earth as compared to Equatorial regions and hence have higher air pressure.
5. Rotation of Earth:
Rotation of Earth produces centrifugal force which has more effect in Equatorial region while lesser effect on Polar regions. Centrifugal force Pushes things away from its core. Same is the effect on air pressure which results into lesser pressure in Equatorial regions as compared to that in polar regions.
Answer:
1. Temperature:
As the temperature increases, air expands because of which its density decreases which results in low pressure. On the other hand air shrinks due to low temperature because of which its density increases which creates high pressure.
The relation between air pressure and temperature is defined with following quote- “When the mercury of thermometer rises, mercury of barometer falls”. Equatorial regions have low pressure because of high temperatures. On the other hand Polar regions have high pressure due to low temperature.
2. Height from Sea Level:
Air pressure is created due to weight of air therefore sea level has highest air pressure. As we move upward from sea level leaving behind the heavy gases at lower layers of atmosphere, air pressure decreases because the upper air is light and its density is low.
There is no fixed rate of fall in air pressure with increase in height but it decreases with increase in height. Air pressure is reduced to half at the height of 5 Kms from seal level and at the height of 11 kms it is reduces to one fourth. It is because of low pressure in mountainous regions that breathing gets hard.
3. Moisture in Air (Humidity):
Conversion of water from liquid state to gaseous state because of evaporation is known as atmospheric humidity. Water vapours are light in weight therefore they rise up and pressure of humid air decreases as compared to dry air. Amount of water vapours changes with time and place and because of this the pressure of air also varies.3. Moisture in Air (Humidity):
Conversion of water from liquid state to gaseous state because of evaporation is known as atmospheric humidity. Water vapours are light in weight therefore they rise up and pressure of humid air decreases as compared to dry air. Amount of water vapours changes with time and place and because of this the pressure of air also varies.
4. Gravitation of Earth:
Atmosphere glues around the Earth due to its gravitation. The intensity of gravitational pull decreases as we get away from core of Earth. Another fact is that as Earth rotates round its axis, average distance of Polar Regions and equatorial regions varies from the core of Earth. For example Polar Regions are nearer to core of the Earth as compared to Equatorial regions and hence have higher air pressure.
5. Rotation of Earth:
Rotation of Earth produces centrifugal force which has more effect in Equatorial region while lesser effect on Polar regions. Centrifugal force Pushes things away from its core. Same is the effect on air pressure which results into lesser pressure in Equatorial regions as compared to that in polar regions.
Explanation:
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