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Meteorology                   Charles A. Giannetta
                             Meteorologist - Professor 

"A I R"

1...There are several tons of air pressure on our bodies. The reason we are not crushed is because the air pressure is equal on all sides. 2...Sound travels through air. Without air there would be no sound. 3...After a heavy rain, air is forced from the ground. Earthworms come to the surface to breath. 4...Air above 1 acre weighs about 40,000 tons. 5...A cubic foot of air at a temperature of 32 degrees F., weighs about 1 ounce. 6...If air is cooled to about -315 Degs. F., it changes to a liquid, called (Liquid Air). It looks like water and pours like water. 7...A person can only live about 10 minutes without air. 8...The mixture of gases in the air has had about 3.5 billion years in which to evolve. 9...Water vapor content of the atmosphere varies depending on the temperature and relative humidity. 10..With 100% humidity, the water vapor content of air varies from 190 ppm at -40 degs.F., (-40 Degs. C.), to 42,000 ppm at 30 Degs. C., (86 Degs. F.). 11..The air pressure at the surface is: 760 mm or 29.92 inches... 1013.2 mb...14.7 lbs. per sq. in.

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