chapter 6 section 1 power point
TRANSCRIPT
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SCIENCECHAPTER 6 WEATHER
SECTION 1WATER IN THE AIR
PG 170-177
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Weather• Condition of the atmosphere at a given moment.
(What is it like outside right now?)
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Water Cycle•Water cycles through Earth’s atmosphere.
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Water Cycle•Evaporation – water changes into water vapor (evaporates)•Condensation – water vapor changes from a gas to liquid (condenses)•Precipitation – liquid and/or frozen water falls from the sky•Runoff – water moves around Earth
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Humidity•Humidity is the amount of water vapor in the air.
•As water evaporates, humidity of air increases
•Air with a higher temperature can hold more water vapor.
•Air that can’t hold any more water is saturated.
•Saturated air has 100% relative humidity
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Factors Affecting Relative Humidity1) Changes to amount of water vapor in air
adding more water vapor increases relative humidity
2) Increase or Decrease of Air TemperatureAir that is colder has a higher relative
humidity Air that is warmer has a lower relative
humidity
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Condensation•Process when water vapor changes into a liquid•Air must be saturated for condensation to occur.•Must be a surface for condensation to occur.
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Dew Point•The temperature at which water vapor condenses to a liquid
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Clouds•A collection of millions of tiny water droplets.
•Clouds are classified by form and altitude.
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Precipitation•Water falls back to Earth as a liquid or solid.•Tiny water droplets combine to form a rain drop.•When the rain drop is too heavy, it falls.
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