Daily Archives: November 15th, 2012

How does an altimeter work?

An aneroid (barometric) altimeter shows a plane’s altitude above the earth by measuring the atmospheric pressure, which lessens as the altitude increases. An altimeter is an instrument that shows a pilot just how high his airplane is above the earth.  Most altimeters are aneroid (without air) barometers, made to read in feet of altitude instead …

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