Transcript Ch. 24 Water in the Atmosphere

Review for the Ch. 23 Quiz
1. Layers of the Atmosphere
2. How do scientists divide the
layers of the atmosphere?
3. In which Layer is most
ozone found?
Quiz Review
1. By what process is water added to the
atmosphere?
2. What does a barometer measure?
3. Aerosol sprays are most harmful to which
layer of the atmosphere?
4. Why are these sprays banned?
5. Know the difference between conduction,
radiation, and convection.
6. What causes pressure differences in the
atmosphere?
7. Where is the atmospheric pressure
highest?
8. Where is the atmospheric pressure
lowest?
9. How do winds move in relationship to
pressure differences?
Add arrows to the dashed lines to indicate the
direction of the wind current on a hot
afternoon.
Land
Ocean
Add arrows to the dashed lines to indicate the
direction of the wind current on a hot
afternoon.
Land
Ocean
Ch. 24 Water in the
Atmosphere
24.1 Atmospheric Moisture
Humidity
The amount of water vapor in the atmosphere.
What did the term saturated mean?
Discuss with your table group…
How does humidity affect wood?
Think about both high humidity
compared to low humidity.
Humidity
Relative Humidity
Mass of water vapor in air
mass of water vapor that the air can hold
What device measures Relative Humidity?
Psychrometer
Hair hygrometer
Specific Humidity
Actual amount of moisture in the air.
Grams of water in 1 kg of air.
Dew Point
The temperature to which air must be cooled to
reach saturation.
24.2 Clouds and Fog
Cloud Formation
Occurs when water vapor condenses into
liquid water droplets.
•
•
•
•
Convective Cooling
Forceful Lifting
Temperature Changes
Advective Cooling
Classification of Clouds
Stratus: sheet like, layered clouds
Cumulus: puffy vertical clouds
Cirrus: highest clouds in the sky, wispy
Fog
Explain what happens on a molecular
level when someone says, “The fog
burned off today.”
Fog
4 Types
1.Radiation fog
2.Advection fog
3.Upslope fog
4.Steam fog
What does each type of fog
formation have in common?
24.3 Precipitation
Any moisture that falls to Earth's Surface.
Causes of Precipitation
Coalescence: combining of water droplets as
they are suspended in air
Supercooling: Water in air solidifies in super
cooled air cells, but doesn't fall due to too few
condensation nuclei.