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Humidity
 

Humidity

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    Humidity Humidity Presentation Transcript

    • Humidity
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Humidity Humidity : the amount of water vapor in the air The maximum quantity of moisture that can be held in the air depends on air temperature
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Humidity Relative Humidity : compares the amount of water vapor present in the air to the maximum amount that the air can hold at that temperature Expressed as a percentage: At 100% relative humidity, air is saturated.
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Humidity
      • Relative Humidity changes when:
      • Atmosphere gains or loses water vapor
        • Evaporation
      • Temperature changes
        • Lower temperature  relative humidity rises
        • Raise temperature  relative humidity decreases
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Humidity
      • Specific Humidity : actual quantity of water held by a parcel of air
      • Grams of water vapor per kilogram of air (g/kg)
      • Highest in equatorial zones
      • Lowest near poles
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Dew-point temperature : temperature at which air with a given humidity will reach saturation when cooled without changing its pressure Humidity
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. The Adiabatic Process
      • Adiabatic Principle : the physical principle that a gas cools as it expands and warms as it is compressed
      • Change in temperature:
      • caused only by a change in pressure
      • not caused by heat flowing in or out of the gas
    • Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. The Adiabatic Process As a parcel of air rises  pressure on the parcel decreases  air expands and cools As a parcel of air descends  pressure on the parcel increases  air is compressed and warms Atmospheric pressure decreases with altitude so...