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atmospheric pressure- and also temperature, decline with altitude. this is the principle behind all aneroid-based altimiters. The instrument, thus has to be compensated before flight by aligning with the current ground-level barometric pressure-all airports have weather stations and this information is passed to pilots by the control towers, hence Barometric pressure is Bracket Twenty nine-8. so the airmen would calibrate the barometer ( on the three o"clock position is a Kollsman window-to 29.8 which is the ground level barometric pressure- the Height indications would then read correct.The altimeter is a refined form of Aneroid barometer.

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Chauncey Kihn

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3y ago

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