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Chapter 23 Section 1 Review(1)

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					Chapter 23 Section 1
 Review Page 580
   1. Explain how most water
   vapor enters the air.

• When water molecules absorb heat
 energy they move so rapidly they
 escape the liquid and enter the air as
 water vapor.
Water Vapor satellite image
  2. Identify the principal
   source from which most
   water vapor enters the
   atmosphere.

• The oceans near the equator
 3. Identify the process by
   which ice changes directly
   into a gas.

• Sublimation (have you ever seen dry
 ice?)
Sublimation
   4. Define humidity.
• Humidity is water vapor in the
 atmosphere.
     5. Compare relative
     humidity with absolute
     humidity.

• Absolute humidity is the mass of water per
  unit volume of air and represents a
  measure of the actual amount of water in
  the air (squeeze a wet sponge).
• Relative humidity is the ratio of water
  vapor in the air compared to how much it
  could hold at a given temperature (how
  full is the sponge?).
6. Describe what happens when
   the temperature of air
   decreases to the dew point or
   below the dew point.
• When temperature decreases the
 rate of condensation increases, and
 the rate of evaporation decreases. At
 the dew point the rate of
 condensation and evaporation are
 equal. Below the dew point,
 condensation occurs and visible
 water droplets form on surfaces.
7. Identify four instruments
   that are used to measure
   relative humidity.

• Dew cells
• Psychrometer
• Hair hygrometers
• Polymer films
8. Explain what would happen
   to a sample of air whose
   relative humidity is 100% if
   the temperature decreased.
• The rate of condensation would
 increase and dew or frost would
 form.
The End…..
9. Which region of Earth
   would you expect to have a
   higher absolute humidity:
   the equatorial region or the
   polar regions.
• Because it is warmer at the equator
 and warmer air can hold more water
 vapor, the absolute humidity would
 be higher at the equatorial region.
10. Use the following terms to
   create a concept map.

    Humidity, water vapor,
   dew point, absolute
   humidity, dew cell,
   psychrometer,
   hygrometer, evaporation,
   condensation, and relative
   humidity.
Water vapor
Water vapor

 humidity
    Water vapor


     humidity

Absolute    Relative
humidity    humidity
           Water vapor


           humidity
Absolute                 Relative
humidity                 humidity

                                      Dew cell

                                    psychrometer

                                    hygrometer
           Water vapor


           humidity
Absolute                 Relative
humidity                 humidity

           Dew cell                 condensation

      hygrometer                    evaporation

     psychrometer




    Where would you put DEW POINT?
The End

				
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posted:10/16/2012
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Jun Wang Jun Wang Dr
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