Question

What is an altimeter ??

Answer 1

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An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water.

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Answer 2

an altimeter is a modified type of aneroid barometer used in aeroplanes to find out the flying height .
it has a dial showing altitude on the basis of average decrease in atmospheric pressure at an approximate rate of 1 inch drop in mercury reading for every 900 ft of ascent..It gives reading in feet for height instead of inches of millibars .
It is also used by surveyors on land.