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Concept of Humidity What is the relationship between water vapor holding and temperature? Air hold more water vapour at higher temperature.

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Presentation on theme: "Concept of Humidity What is the relationship between water vapor holding and temperature? Air hold more water vapour at higher temperature."— Presentation transcript:

1

2 Concept of Humidity

3 What is the relationship between water vapor holding and temperature? Air hold more water vapour at higher temperature.

4 Humidity The amount of water vapour in the air (Holding) Capacity of air The maximum amount of water vapour in the air

5 Conditions of Saturated & Unsaturated Saturated: an air mass holding maximum amount of water vapour Unsaturated: an air mass holding less than the saturated amount Supersaturated: an air holding more than the maximum amount

6 Humidity Indicator (1) Absolute Humidity (Water Vapour Density) Mass of water vapour / Volume of air meaning of mass = weight

7 Why do we seldom use the indicator of absolute humidity? Because the humidity concentration depends on temperature BUT absolute humidity does not consider such change

8 Humidity Indicator (2) Relative Humidity Water vapour content / water vapour capacity Vapour pressure / saturated vapour pressure Different formula, but same thing hPa mg/cubic m

9 Spatial Distribution of RH globally

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