Chapter 23 Section 1 Review Page 580

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Chapter 23 Section 1 Review Page 580
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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.

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Water Vapor satellite image
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2. Identify the principal source from which
most water vapor enters the atmosphere.

• The oceans near the equator

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3. Identify the process by which ice changes
directly into a gas.

• Sublimation (have you ever seen dry ice?)

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Sublimation
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4. Define humidity.

• Humidity is water vapor in the atmosphere.

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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?).

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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.

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7. Identify four instruments that are used to
measure relative humidity.

• Dew cells
• Psychrometer
• Hair hygrometers
• Polymer films

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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.

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The End..
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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.

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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.
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Where would you put DEW POINT?
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The End
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