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simpl the mass of air above a give level.
an instrument that measures bars
is a unit of pressure that descibes a force over a given area
- -the unit of pressure commonly found on surface weather maps.
- -1 bar = 1000mb
- a more convenient unit
- -1hPa = 1mb
the barometer reading at a particular location and elevation.
the level representing the average surface of the ocean.
lines connecting point of equal pressure
lines connecting points of equal elevation
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
pressure of a gas is equal to its temperature times its density times a constant
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
gravity is balanced by PGF