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SlideshowReport

Air Pressure and Altitude

Description
Pressure changes
Pressure is the weight of the air above
Average sea level pressure
Slightly more than 1000 millibars
About 14.7 pounds per square inch
Pressure decreases with altitude
One-half of the atmosphere is below 3.5 miles (5.6 km)
Ninety percent of the atmosphere is below 10 miles (16 km)
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