Altimeters

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  • Altimeters
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Abstract from DBPedia
    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. The most common unit for altimeter calibration worldwide is hectopascals (hPa), except for North America (other than Canada) and Japan where inches of mercury (inHg) are used. To obtain an accurate altitude reading in either feet or meters, the local barometric pressure must be calibrated correctly using the barometric formula.

    高度計（こうどけい、英語: altimeter）は、高度を知るための機器であり、主に航空機や登山で用いられる。大きく分けて、気圧高度計と電波高度計がある。

    (Source: http://dbpedia.org/resource/Altimeter)