Altitudeelevation 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.
- High altitude = 1500m - 3500m
- Very High altitude = 3500m - 5500m
- Extreme altitude = 5500m - above
- Troposphere - 8 km (above poles) - 18 km (above equator).
- Stratosphere - 10km (above poles) 50 km (above equator)Ozone layer
- Mesosphere - 50 km - 80 km
- Thermosphere - 100-200 km (1000ð-1500ð K)
- Exosphere - 500 km - 10,000km (outer space)
In geometry, an altitude of a triangle is a line passing through one vertex and being perpendicular to the opposite side. See altitude (triangle).