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Air pressure and weather

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Air pressure and weather

  1. 1. Air Pressure
  2. 2. Air Pressure• Air Pressure is a measure of the force of the air pressing down on the earth’s surface
  3. 3. http://www.youtube.com/watch?v=OHY9fFQhX68 Marshmallows
  4. 4. Air Pressure can vary at any particular point on the Earth depending on the density of the air Density = mass / volume
  5. 5. Where is air pressure higher, up in the mountains ordown in thevalley?
  6. 6. http://www.youtube.com/watch?v=GWEyFbyv Elc&feature=related Air Pressure and Altitude
  7. 7. This bottle was photographed at 3600m (left) then again at sea level (right) At sea level, because air is compressible, the weight of all that air above us compresses the air around us, making it denser.We all live underneath a huge ocean ofair that is several miles deep: theatmosphere.The pressure on our bodies is about thesame as ten meters of sea waterpressing down on us all the time.
  8. 8. Density = Mass / Volume Warm air is less dense than coolair. Warm air rises. Cool air sinks. Air at high altitudes is less dense than air at lower altitudes.
  9. 9. Factors that affect Air PressureTemperature Water Vapor Elevation
  10. 10. TEMPERATURE AND AIR PRESSURE Molecules HEAT move fasterLESS AIR MovePRESSURE apart, become fewer and weigh less
  11. 11. HIGHTEMPERATURE, LOW AIRPRESSURELOWTEMPERATURE, HIGH AIRPRESSURE
  12. 12. AMOUNT OF WATER VAPOR consists of air and water molecules
  13. 13. More water vapor meansless air molecules (more water molecules) LOW AIR PRESSURE DRY AIR = HIGH AIR PRESSURE
  14. 14. Air Pressure & Weather
  15. 15. High pressure generallymeans fair weather Air mass in upper atmosphere No clouds Warm, moi st airLayer of Air cannot rise
  16. 16. Low pressure generally means cloudy, rainy weather Warm airAir masses rises, cloudsmove apart form
  17. 17. High Pressure System: Indicates clear, calmWeather map conditions with reduced chance of precipitation. Drier air usually results in a greater range of high and low temperatures.Low pressure system: Increasedcloudiness, winds, temperatures, and chanceof precipitation.
  18. 18. Measuring Air Pressure Types of BarometerAir Mercury BarometerPressure Aneroidis measuredby aninstrument
  19. 19. Air pressureincreases, column of mercuryrises Air pressure decreases, colu mn of mercury drops
  20. 20. High Pressure:Rising or steady - Continued fairSlowing falling - FairRapidly falling - Cloudy, WarmerMedium pressure:Rising or steady - Same as presentSlowing falling - Little changeRapidly falling - Precipitation likelyLow Pressure:Rising or steady - Clearing, coolerSlowing falling - PrecipitationRapid falling - Storm
  21. 21. Factors Affecting Air Pressure FACTOR Increase/Decrease Air PressureDensityDensityTemperatureTemperatureWater VaporWater VaporAltitudeAltitude
  22. 22. At the top of a mountain How does air pressure you drank a bottle of affect scuba diving?water, sealed it, but imploded on yourway down. Why? A rising barometer A series of hot, humid indicates a spell of days is preceded by a cool dry weather. falling barometer.A southern, coastal areas tend to have Rapidly droppinglower air pressure than an inland area temperatures arefarther north. accompanied by a rising barometer.You are planning a Why would a seriousPicnic and check the athlete decide to trainbarometer, which is at a high altitude?falling. Why should youcancel the picnic?You are hiking Mount Everest How does a hot airand find it hard to breathe at balloon work?a high altitude.

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