![]() ![]() The greater the altitude, the lower the pressure. Pressure altimeter ĭigital barometric pressure sensor for altitude measurement in consumer electronic applicationsĪltitude can be determined based on the measurement of atmospheric pressure. Alexander Bryce a Scottish minister and astronomer in 1772 who realised that the principles of a barometer could be adjusted to measure height. The scientific principles behind the altimeter were first written by Rev. To obtain an accurate altitude reading in either feet or meters, the local barometric pressure must be calibrated correctly using the barometric formula. ) and Japan where inches of mercury (inHg) are used. The most common unit for altimeter calibration worldwide is hectopascals (hPa), except for North America (other than Canada The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water. Reference pressure of about 29.92 inHg (1013 hPa) is showing in the Kollsman windowĪn altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. Diagram showing the face of the "three-pointer" sensitive aircraft altimeter displaying an altitude of 10,180 ft (3,100 m). ![]()
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