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Air Pressure

Air Pressure. Air Pressure : the result of the weight of a column of air pushing down on an object (the amount of air pressing down on an object). Tools and Units. Barometer : a device that measures air pressure

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Air Pressure

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  1. Air Pressure

  2. Air Pressure: the result of the weight of a column of air pushing down on an object (the amount of air pressing down on an object)

  3. Tools and Units • Barometer: a device that measures air pressure • Mercury Barometer: consists of a glass tube partially filled with mercury, with its open end resting in a dish of mercury • Aneroid Barometer: has an airtight metal chamber with no water • Units are inches or millibars (mb) • 1in of mercury=33.87 millibars

  4. Importance • Do basic weather forcasting • Barometric pressure changes when a storm comes • The lower the air pressure, the more severe the storm • The higher you go, the lower the air pressure

  5. Other Info • 1000mb is a sunny day • 900mb is a severe thunderstorm • Air flows from high pressure to low pressure • Causes wind

  6. Bibliography • http://www.usatoday.com/weather/wbarocx.htm • http://www.freefoto.com/preview/16-11-51?ffid=16-11-51 • http://kids.earth.nasa.gov/archive/air_pressure/barometer.html • http://www.wxdude.com/page15.html • http://www.rcn27.dial.pipex.com/cloudsrus/pressure.html

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