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AIR PRESSURE (PowerPoint)

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					   Chapter 18
Test 5 material
         Begin
   AIR EXERTS A FORCE ON THE SURFACE OF
    OBJECTS THAT IT CONTACTS.
   AIR PRESSURE IS A MEASURE OF THAT FORCE
    PER UNIT OF SURFACE AREA
   WITH FEWER AIR MOLECULES IN THE UPPER
    ATMOSPHERE, THE PRESSURE DECREASES AS
    WE RISE IN THE ATMOSPHERE
   IT DECREASES AT AN INCREASING RATE
   MOUNTAIN SICKNESS
   DIZZY
   HEADACHE
   SHORTNESS OF BREATH
   RED BLOOD CELL COUNT NEEDS TO INCREASE
   THINK CUBS WILL WIN IT ALL
   AIR PRESSURE DIFFERS FROM ONE PLACE TO
    ANOTHER AND THESE MIGHT NOT BE FROM
    ELEVATION DIFFERENCES ALONE
   HUGE VOLUME OF AIR THAT IS RELATIVELY
    UNIFORM IN TEMPERATURE, DENSITY, AND
    WATER VAPOR CONTENT
   AS AIR MASS MOVES ACROSS THE EARTH’S
    SURFACE THE PRESSURE FALLS OR RISES
    BASED UPON QUALITY OF THE AIR MASS
   RISING PRESSURE = IMPROVING WEATHER
   FALLING PRESSURE = STORM Y WEATHER
   STEADY PRESSURE = WEATHER STAYS THE
    SAME
   COLD OR WARM AIR?

   DRY OR MOIST AIR?
   WHEN MOISTURE IS ADDED TO THE AIR, A
    HEAVIER GAS IS REPLACED BY THE WATER
    VAPOR SO MOIST AIR IS LIGHTER THAN DRY
    AIR
   DIVERGENCE OF AIR

   ANTICYCLONE
   CONVERGANCE OF AIR

   CYCLONE
   MILLIBARS = 1014 MB AT SEA LEVEL

   INCHES = 29.92 INCHES AT SEA LEVEL
   BAROMETER - MERCURY OR ANEROID (
    LEGENDS ON THE DIAL)
   BAROGRAPH
   ALTIMETER
◦ Chapter 18
◦ Test 5 Material
   PRESSURE GRADIENTS
   CORIOLIS EFFECT
   FRICTION
   CENTRIPETAL AND CENTRIFUGAL FORCE
   GRAVITY
   A GRADIENT IS SIMPLY A CHANGE IN SOME
    PROPERTY WITH DISTANCE. PRESSURE
    GRADIENT IS DIFFERENCE IN AIR PRESSURE
    FROM ONE PLACE TO ANOTHER.
   A GRADIENT IS SIMPLY A CHANGE IN SOME
    PROPERTY WITH DISTANCE. PRESSURE
    GRADIENT IS DIFFERENCE IN AIR PRESSURE
    FROM ONE PLACE TO ANOTHER.
   AN ISOBAR IS A LINE THAT CONNECTS POINTS
    OF EQUAL AIR PRESSURE.
   WHEN ISOBARS ARE CLOSELY SPACED, WE
    HAVE A STRONG PRESSURE GRADIENT AND
    HIGH WINDS.
   WHEN THE ISOBARS ARE FAR APART, THE
    GRADIENT IS WEAK AND WINDS ARE LIGHT.
   EARTH’S ROTATION IS RESPONSIBLE FOR THE
    CORIOLIS EFFECT WHICH IS A DEFLECTION OF
    THE WINDS.
   IN THE NORTHERN HEMISPHERE, WINDS ARE
    DEFLECTED TO THE RIGHT;
   IN THE SOUTHERN HEMISPHERE TO THE LEFT.
   AN INWARD PULLING FORCE
   AN OUTWARD PULLING FORCE
   CENTRIPETAL AND CENTRIFUGAL FORCE
    TOGETHER PRODUCE A CIRCULAR PATTERN
    OF WINDS AROUND HIGH AND LOW PRESSURE
    SYSTEMS

				
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