Altitude

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.

Related Topics:
Elevation - Datum

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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.

Related Topics:
Aviation - Mean sea level - Flight level - Altimeter

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Atmospheric pressure decreases with altitude.

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In North America and the UK altitude is usually measured in feet. In continental Europe and other parts of the world altitude is measured in metres.

Related Topics:
North America - UK - Europe - Metre

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• 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)
 
Altitude: Altitude records ►