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 Form 1 Geography Online Lessons on Weather

In this Lesson we are going to discuss the Factors Influencing Atmospheric Pressure

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Answer Text:
Atmospheric pressure
Factors Influencing Atmospheric Pressure
1. Altitude
• Pressure decreases with increase in altitude because the column of air becomes shorter hence it exerts less weight.
2. Temperature
• When air is heated it expands and exerts pressure over a large area resulting in reduced pressure.
• When it’s cooled it contracts and exerts pressure over a small area resulting in increased pressure.
3. Rotation of the earth
• Rotation pushes air masses from poles towards the equator causing air to spread out and occupy more space causing it to expand making pressure to decrease.
• When air from the equator moves towards the poles it occupies less space causing it to contract resulting into high pressure.


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