Water in the Atmosphere

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• Water in the Atmosphere

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Condensation

• The process by which molecules of water vapor in
  the air become liquid water.

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Evaporation

• The process by which water molecules in liquid
  water escape into the air as water vapor

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Humidity

• A measure of the amount of water vapor in the air

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Relative Humidity

• The percentage of water vapor in the air

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Relative Humidity
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Relative Humidity
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Relative Humidity
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Psychrometer

• Instrument with two thermometers, a wet-bulb and
  a dry-bulb thermometer

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Dew Point

• The temperature at which condensation begins

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Cumulus

• Clouds that look like fluffy, rounded piles of
  cotton.

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Stratus

• Clouds that form in flat layers

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Cirrus

• Wispy, feathery clouds

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The End