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 transcript:

Concept of Humidity

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

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

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

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

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

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

Spatial Distribution of RH globally