Weather chapter 8

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Author:
jmoritz001
ID:
122778
Filename:
Weather chapter 8
Updated:
2011-12-11 19:31:25
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weather chapter
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weather chapter 8
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  1. air pressure
    simpl the mass of air above a give level.
  2. barometer
    an instrument that measures bars
  3. bar
    is a unit of pressure that descibes a force over a given area
  4. milliabar
    • -the unit of pressure commonly found on surface weather maps.
    • -1 bar = 1000mb
  5. Hectopascal(hPa)
    • a more convenient unit
    • -1hPa = 1mb
  6. station pressure
    the barometer reading at a particular location and elevation.
  7. sea-level pressure
    the level representing the average surface of the ocean.
  8. isobars
    lines connecting point of equal pressure
  9. countour lines
    lines connecting points of equal elevation
  10. what are the 4 forces that influence wind?
    • 1. Pressure gradient force(PGF)
    • 2. Coriolis Force (CF)
    • 3. Centripetal Force
    • - only applys to curved wind motion
    • 4. Friction
    • -slows the wind
  11. gass law
    pressure of a gas is equal to its temperature times its density times a constant
  12. The magnitude of Cinfrical force depends on what 3 factors?
    • 1. Rotaion of the earth
    • 2. Latitude
    • -at equator = no CF
    • -higher latitude = stronger CF
    • 3. Wind speed
    • -no wind = no CF
    • stronger wind = stronger CF
  13. Hydrostatic Equilibrium
    gravity is balanced by PGF

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