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# Assuming that pressure of barometer at sea level is 74 cm, will the pressure increase, decrease or stay the same when the barometer was taken up to a high mountain?

Question #85203. Asked by kaung30. (Aug 31 07 11:28 PM)

Hrainian

Pressure decreases with elevation

 Sep 01 07, 12:34 AM
MonkeyOnALeash

It is this principle that causes an Aeronautical Altimeter to work.

"Altimeter:

Any device which measures the height of an aircraft. The two chief types are the pressure altimeter, which measures the aircraft's distance above sea level, and the radar altimeter, which measures distance above the ground........A pressure altimeter precisely measures the pressure of the air at the level an aircraft is flying and converts the pressure measurement to an indication of height above sea level according to a standard pressure-altitude relationship. In essence, a pressure altimeter is a highly refined aneroid barometer since it utilizes an evacuated capsule whose movement or force is directly related to the pressure on the outside of the capsule."

 Sep 01 07, 2:34 AM

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