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Unformatted text preview: Measured with a barometer Average pressure at sea level can be expressed in different ways: 1 kilogram/cm2=15 pounds/in2= 101,320 Pa (pascals)=76 cm Hg (mercury)=29.92 in Hg=1013.2 mb (millibars) Values are important because they provide the cutoff measurements used to define low and high pressure cells. Atmospheric pressure at a single location varies slightly from day to day. Differences in atmospheric pressure circulate the air, and create our winds Helps to cycle water from oceans to the landmasses Is an important factor in driving the worlds ocean currents. Air Pressure- mass of air above a given level. Atmospheric pressure always decreases with increasing height. Air molecules exert a force on all surfaces with which they are in contact and the amount of that force exerted per unit of surface area is pressure....
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This note was uploaded on 06/12/2011 for the course GEOGRAPHY 600-201010 taught by Professor Christopherpost during the Spring '10 term at Kent State.
- Spring '10