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A barometer can be used to measure an airplane's altitude by comparing the barometric pressure at a given flying altitude to that on the ground.

A barometer can be used to measure an airplane's altitude by comparing the barometric pressure at a given flying altitude to that on the ground. Determine an airplane's altitude if the pilot measures the barometric pressure at 700 mm Hg, the ground reports it at 7 58 mmHg, and the average air density is 1.19 kg/m³, g= 9.8 m/s²

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