Humidity
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. Humidity Humidity : the amount of wat...
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. Humidity Relative Humidity : compares...
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. Humidity <ul><li>Relative Humidity ch...
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. Humidity <ul><li>Specific Humidity : ...
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. Dew-point temperature : temperature a...
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. The Adiabatic Process <ul><li>Adiabat...
Visualizing Physical Geography Copyright  © 2008 John Wiley and Sons Publishers Inc. The Adiabatic Process As a parcel of ...
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Humidity

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Humidity

  1. 1. Humidity
  2. 2. 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
  3. 3. 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.
  4. 4. Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Humidity <ul><li>Relative Humidity changes when: </li></ul><ul><li>Atmosphere gains or loses water vapor </li></ul><ul><ul><li>Evaporation </li></ul></ul><ul><li>Temperature changes </li></ul><ul><ul><li>Lower temperature  relative humidity rises </li></ul></ul><ul><ul><li>Raise temperature  relative humidity decreases </li></ul></ul>
  5. 5. Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. Humidity <ul><li>Specific Humidity : actual quantity of water held by a parcel of air </li></ul><ul><li>Grams of water vapor per kilogram of air (g/kg) </li></ul><ul><li>Highest in equatorial zones </li></ul><ul><li>Lowest near poles </li></ul>
  6. 6. 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
  7. 7. Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc. The Adiabatic Process <ul><li>Adiabatic Principle : the physical principle that a gas cools as it expands and warms as it is compressed </li></ul><ul><li>Change in temperature: </li></ul><ul><li>caused only by a change in pressure </li></ul><ul><li>not caused by heat flowing in or out of the gas </li></ul>
  8. 8. 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...
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