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Altitude is the elevation of an object from a known level or datum, called zero level. Most often this level is defined as the absolute sea level, but it can vary.
In aviation, the term altitude is used to describe elevation above mean sea level, the term height refers to elevation above a ground reference point and the term flight level is the elevation according to a standard pressure altimeter setting.
Atmospheric pressure decreases with altitude.
In North America and the UK altitude is usually measured in feet. Everywhere else in the world the altitude is measured in metres.
- High altitude = 1500m – 3500m
- Very High altitude = 3500m – 5500m
- Extreme altitude = 5500m – above
- Troposphere — 8 km (above poles) – 18 km (above equator).
- Tropopause
- Stratosphere — 10km (above poles) 50 km (above equator),contains the Ozone layer
- Mesosphere — 50 km – 80 km
- Thermosphere — 100–200 km (1000°–1500° K)
- Exosphere — 500 km – 10,000km (outer space)
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Altitude records
- 19 September, 1783 — 500m (1,700ft) animal carrying Montgolfier hot-air balloon.
- 15 October, 1783 — 26m (84ft) Pilâtre de Rozier in a Montgolfier tethered balloon.
- 1 December, 1783 — 2.7km Professor Charles and assistant Robert in Charliere, his hydrogen-filled balloon.
- 1784 — 4km Pilâtre de Rozier and the chemist Proust in a Montgolfier.
- 18 July, 1803 — 7.28km Etienne Gaspar Robertson and Lhoest in a balloon.
- 1839 — 7.9km Charles Green and Spencer Rush in a free balloon.
- 5 September, 1862 — 9km Coxwell and English physicist Glaisher in a balloon.
- 4 December, 1894 — 9.155km German meteorologist Berson in an airship.
- 31 July, 1901 — 10.8km German meteorologist Berson and Süring in a free balloon.
See also
Altitude in astronomy
In astronomy and surveying, altitude (sometimes called elevation) is one of the two coordinates of the horizontal coordinate system, and refers to the vertical angle from the horizon. The other coordinate is azimuth, which refers to the horizontal angle from the north.
The altitude, α, of a star is given by:
where δ is the declination of the object, HA is its hour angle, and φ is the latitude of the observer.
Altitude in geometry
In geometry, an altitude of a triangle is a line passing through one vertex and being perpendicular to the opposite side. See altitude (triangle).
Altitude in music
In music, the altitude of a note is its height or depth relative to Middle C. For example, Soprano C has a much higher altitude than Tenor C.