Water in the Atmosphere

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Water in the Atmosphere
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What do you observe from the glass/water/ice
demo. Why do you see this?

• Explanation
• water in the atmosphere video

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Water Cycle -The continuous movement of water
between the atmosphere and Earths surface.
takes about 9 days
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Humidity

• A measure of the amount of water vapor in the
  air.
• Warm air can hold more water vapor than cool air.

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Relative Humidity

• The percentage of water vapor that is in the air
  compared to the maximum amount of water vapor the
  air can hold.
• Depends on temperature
• Higher results in precipitation
• Demo or relative humidity demo

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Psychrometer

• Used to measure relative humidity
• Has a wet-bulb thermometer and a dry-bulb
  thermometer.
• The wet-bulb thermometer is cooled by
  evaporation, so the reading drops below that of
  the dry-bulb thermometer.
• Analyze data on p.302

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How Does Fog/ Cloud Form?

• Condensation molecules of water vapor in the air
  become liquid water (remember the FQ video)
• Two conditions are required for condensation
  cooling of the air below dew point and the
  presence of particles in the air.
• hot water fog and fog in a bottle

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Dew Point

• The temperature at which condensation begins.
• saturation point
• tomorrows lab

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Types of Clouds

• Classified by
• shape
• altitude
• precipitation
• NASA cloud video

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Types of Clouds

• Cirrus ( means a curl of hair)
• Cumulus ( means heap or mass)
• Stratus ( spread out, wispy)

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Prefix

• Nimbus-/Nimbo- means the cloud produces rain or
  snow
• ex Nimbostratus, Cumulonimbus
• Alto- means medium-altitude cloudex
  Altostratus, altocumulus
• Cirro- means high-altitude cloudex Cirrocumulus

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