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 Form 1 Geography Online Lessons on Weather

In this lesson we are going to learn on the Factors Influencing Humidity

 (9m 15s)
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Answer Text:
Humidity
Factors Influencing Humidity
1. Temperature
• Places with high temperature experience high humidity due to high evaporation and air having high capacity to hold moisture.
• Places with low temperature have low humidity due to low evaporation and air having low capacity to hold moisture.
2. Source of Moisture
• Areas near water bodies e.g. Kisumu and Mombasa experience high humidity due to evaporation of water from the water body.
• Places near thick vegetation also have high humidity due to evapotranspiration.
• Areas far away from water bodies such as the middle of deserts have low humidity.
• Areas receiving heavy rainfall also have high humidity.
3. Air Pressure
• There is high humidity at low altitudes because high pressure compresses air warming it increasing its capacity to hold moisture and also causes high evaporation.
• There is low pressure at high altitudes because air expands and cools thus reducing its capacity to hold moisture.
4. Latitude
• Low latitudes experience high humidity due to high temperatures resulting into high rates of evaporation and air having high capacity to hold moisture.
• High latitudes experience low humidity due to low temperatures resulting into low rates of evaporation and air having low capacity to hold moisture.
Significance of Humidity/Moisture
1. Affects rain formation in such a way that places with high humidity are likely to experience higher rainfall than those with low humidity.
2. Regulates the heat loss from the earth’s surface by absorbing terrestrial radiation (process in which the earth gives off heat into the atmosphere).


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