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| simply the pressure exerted by the weight of air above |
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| to measure atmospheric pressure, we use this unit of force from the science of physics |
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| 100 newtons per square meter |
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| provides a continuous record of pressure changes with the passage of time |
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| there is a net flow of air into a region |
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| regions where there is a net outflow of air; pressure drops |
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| far more air is involved in horizontal movement |
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| lines connecting places of equal pressure |
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| the amount of pressure change occurring over a given distance |
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| the important balance that is usually maintained between these two opposing forces |
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| deviation is the result of Earth's rotation |
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| flow in a straight path, parallel to the isobars with velocities proportional to the pressure-gradient force |
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| In the Northern Hemisphere if you stand with your back to the wind, low pressure will be found to your left and high pressure to your right |
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| winds that blow at a constant speed parallel to curved isobars |
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| counterclockwise in the NH and clockwise in the SH |
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| useful in short-range weather prediction |
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| commonly used to determine wind direction |
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| when the wind consistently blows more often from one direction than from any other |
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