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ShareAltitude is the elevation of an object from a known level or datum.
See also:
Common datums are mean sea level and the surface of the WGS-84 geoid, used by GPS.
In the United States and the UK aviation altitude is usually measured in feet.
Everywhere else in the world the altitude is measured in metres. Atmospheric pressure decreases as altitude increases.
This principle is the basis of operation of the pressure altimeter, which is an aneroid barometer calibrated to indicate altitude instead of pressure.
It is the fall in pressure that leads to a shortage of oxygen (hypoxia) in humans on ascent to high altitude.
For more information about the topic Altitude, read the full article at Wikipedia.org, or see the following related articles:
Altimeter — An altimeter is an active instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, ... > read more
Sea level — Mean sea level (MSL) is the average (mean) height of the sea, with reference to a suitable reference surface. Defining the reference level, however, ... > read more
Boiling — Boiling is the rapid vaporization of a liquid, which typically occurs when a liquid is heated to a temperature such that its vapor pressure is above ... > read more
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