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WeatherAir Temperature
Air near Earth's Surface
TemperatureTemperatureWarmer Colder
isless dense
has low pressure
holdsmore watervapor
ismoredense
hashigh pressure
holdslesswatervapor
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Water falling from the clouds
The amount of water vapor present in the air is called ______________
Review Question...
The state of the atmosphere at a specific time and place is called _________
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Answers to homework questions
Why can more water vapor be present in warm are than in cold air?
At warmer temperatures the water molecules move quickly and don't easily cometogether. At cooler temperatures, molecules in air move more slowly. The slower movement allows water vapor molecules to stick together and form droplets.
1 Water vapor condenses when it cools to the dew point
2. Humidity is the amount of water vapor present in the air. Relative humidity is the amount of water vapor present in the air compared to the amount that is needed for saturation.
3. Cloud form when warm, moist air is lifted and cools to its dew point. Water vaporcondenses around dust particles and forms cloud drops.
4. cloud droplets combine and grow large enough to fall to Earth. The temperature of the atmosphere determines the type of precipitation.
Fronts
A boundary between 2 air masses that have different density, moisture, or temperature is called a front
Cloudiness, precipitation and storms sometimes occur at frontal boundaries
Types of frontscoldwarmoccludedstationary click here to view video on fronts
Cold FrontCold Front Warm Front
Occluded Front Stationary Front
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http://player.discoveryeducation.com/index.cfm?guidAssetId=B3C0DBEEFB314DBE94CCF5381BE77817&blnFromSearch=1&productcode=US