Pressure altitude
McGraw-Hill Science & Technology Dictionary:
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pressure altitude
(′presh·ər ′al·tə′tüd)
(meteorology) The height above sea level at which the existing atmospheric pressure would be duplicated in the standard atmosphere; atmospheric pressure expressed as height according to a standard scale.
US Defense Department Military Dictionary:
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pressure altitude
(DOD, NATO) An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere. See also altitude.
McGraw-Hill Dictionary of Aviation:
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pressure altitude
An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere (ICAO). It is the height of an aircraft as measured from an assumed sea level atmospheric pressure level of 1013.2 hectopascals (hPa) or 29.92 of mercury (Hg). This is used to indicate flight levels and as a common setting for the cruising level. When aircraft are flying at a given pressure altitude, their height above mean sea level is not constant; it varies depending on the variation of pressure prevalent at the height from the standard pressure. See absolute altimeter.
Wikipedia on Answers.com:
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Pressure altitude
In aviation, pressure altitude is the indicated altitude when an altimeter is set to an agreed baseline pressure setting. The baseline pressure is 1013.25 hPa, equivalent to 1013.25 millibar, or 29.92 inches of mercury. This setting is equivalent to the air pressure at mean sea level (MSL) in the International Standard Atmosphere (ISA). Pressure altitude is primarily used in aircraft performance calculations and in high-altitude flight (above the transition altitude). In radio communication, the baseline pressure setting is referred to by the Q code QNE.[1]
The relationship between static pressure and pressure altitude is defined in terms of the properties of the International Standard Atmosphere.
See also
- QNH
- Flight Level
- density altitude
- Standard conditions for temperature and pressure
- Barometric formula
External links
References
- ^ Brandon, John (2007-04-12). "Altitude and altimeters". Recreational Aviation Australia Inc. Archived from the original on 2008-08-03. http://web.archive.org/web/20080803173753/http://www.auf.asn.au/groundschool/umodule3.html#altitude. Retrieved 2008-10-05.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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US Defense Department Military Dictionary
US Department of Defense Dictionary of Military and Associated Words, 2003.
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McGraw-Hill Dictionary of Aviation
An Illustrated Dictionary of Aviation.. Copyright © 2005 by McGraw-Hill Companies, Inc. All rights reserved.
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Mentioned in
cruising altitude
(navigation)
density airspeed
(aerospace engineering)
stalling Mach number
(aerospace engineering)
D value
(navigation)
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