Pg tp-class21-humidity

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Pg tp-class21-humidity

  1. 1. Class 21: Humidity
  2. 2.  A measure of how much water vapor is in the air
  3. 3. 20% 60% 0% 0% 0% 0% 20% 0% 1. Transpiration 2. Evaporation 3. Deposition 4. Sublimation 5. Condensation 6. 1, 2 and 3 7. 2, 3 and 5 8. 1, 2 and 4
  4. 4. 0% 20% 20% 40% 20% 1. Condensation increases 2. Evaporation increases 3. Condensation + evaporation increas 4. Evaporation decreases 5. Both condensation and evaporation decrease
  5. 5. 60% 0% 20% 20% 0% 1. Will lead to high rates of evaporation 2. Will lead to low rates of evaporation 3. May lead to condensation 4. 1 and 2 5. 2 and 3
  6. 6.  Actual amount of water vapor ◦ Absolute Humidity ◦ Specific Humidity ◦ Vapor Pressure ◦ Dew Point
  7. 7.  Mass of water vapor/volume of air  Units: grams/cubic meter  Maximum potential absolute humidity related to temperature  Temperature increase = increase in potential maximum
  8. 8.  Mass of water vapor per mass of air  Grams of water vapor/kilograms of air
  9. 9.  The portion of air pressure that comes from water vapor  Units: same as air pressure (millibars)  Saturation vapor pressure = maximum possible  Above saturation  condensation
  10. 10. 1. Evaporation 2. Transpiration 3. Condensation
  11. 11. 1. Add more moisture and lower temperature 2. Remove water vapor and lower temperature 3. Add more moisture and raise temp 4. Remove water vapor and raise temp
  12. 12. 1. Relative humidity will increase 2. Relative humidity will stay same 3. Relative humidity will decrease
  13. 13. 1. Warm air 2. Cold air
  14. 14.  As air cools, maximum water vapor can be reached.  Dew Pt temperature = temp. at which this occurs  100% Relative Humidity or Saturation
  15. 15. 1. The actual amount of water vapor in the air 2. The relative humidity
  16. 16. 1. A high amount of water vapor 2. A low amount of water vapor 3. A high relative humidity 4. A low relative humidity
  17. 17. 0% 0% 0% 0% 0% 0% 0% 0% 1. By evaporation of more water 2. By condensation of more water 3. By lowering temperature 4. By raising temperature 5. 1 and 3 6. 2 and 4 7. 1 and 4 8. 2 and 3
  18. 18.  Hot and dry vs. hot and humid (heat index)  Cold and humid vs. cold and dry  Wind chill

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