The density of the air also affects how well an aircraft works. There is an International Standard Atmosphere chart that converts density to altitude. This depends on atmospheric conditions (mainly heat and humidity). Density altitude - Altitude measured using the density of the air.Pressure altitude and indicated altitude are the same when the altimeter is adjusted to use this standard level. The air pressure at sea level is normally 1013.25 millibars or 29.92" Hg, when the air temperature is 15 ☌ (59 ☏). Pressure altitude - Altitude measured using air pressure.This can also be called the terrain elevation. Height - Altitude in terms of the distance above some point.Absolute altitude - Altitude as the distance above the terrain (the ground) directly below it (Above Ground Level).True altitude - Altitude as the distance above sea level.It is usually pretty good, but can be fooled a bit sometimes, it needs to be adjusted to use the local barometric pressure. Indicated altitude - What the altimeter indicates (shows) for the height above sea level.In simple terms, these types of altitude can be explained as ways of measuring the altitude: There are several types of aviation altitude. The common pressure altimeter is a type of barometer with a dial showing distance ( feet or metres) instead of atmospheric pressure. The instrument for measuring altitude is the altimeter (from altitude and meter). This pressure can be measured and this can be converted into a height above sea level. The air gets thinner the higher it is (and it has less pressure, because there's less air pushing down on it from above). The height is either from the average sea level (also called Mean Sea Level or MSL), or from the ground (also called Above Ground Level, or AGL).Īirplanes can find their altitude by using air pressure. In aviation, the altitude can be measured and shown in several different ways.
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