FACTOID # 11: Oklahoma has the highest rate of women in State or Federal correctional facilities.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Altitude" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Altitude

Altitude is the elevation of an object from a known level or datum. Common datums are mean sea level and the surface of the WGS-84 geoid, used by GPS. In the United States and the UK aviation altitude is usually measured in feet. Everywhere else in the world the altitude is measured in metres. Basic Definition In geography, the elevation of a geographic location is its height above mean sea level (or some other fixed point). ... It has been suggested that this article or section be merged with Geodetic system. ... For considerations of sea level change, in particular rise associated with possible global warming, see sea level rise. ... WGS 84 is the 1984 revision of the World Geodetic System. ... The GOCE project will measure high-accuracy gravity gradients and provide an accurate geoid model based on the Earths gravity field. ... Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ... Aviation refers to flying using aircraft, machines designed by humans for atmospheric flight. ... The metre, or meter (US), is a measure of length. ...


Atmospheric pressure decreases as altitude increases. This principle is the basis of operation of the pressure altimeter, which is an aneroid barometer calibrated to indicate altitude instead of pressure. It is the fall in pressure that leads to a shortage of oxygen (hypoxia) in humans on ascent to high altitude. (Altitude pressure calculator) Diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure at any point in the Earths atmosphere. ... Kollsman-type barometric aircraft altimeter as used in North America An altimeter is an active instrument used to measure the altitude of an object above a fixed level. ... A barometer is an instrument used to measure atmospheric pressure. ... Hypoxia is a pathological condition in which the body as a whole (generalised hypoxia) or region of the body (tissue hypoxia) is deprived of adequate oxygen supply. ...

Contents

Altitude in aviation

In aviation, the term altitude can have several meanings. It is a fundamental tenet of flight safety that both parties exchanging information concerning this topic are absolutely clear which definition is being used. (AFM 51-40) Aviation refers to flying using aircraft, machines designed by humans for atmospheric flight. ...

  • True altitude is the elevation above mean sea level. In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from mean sea level; this is referred to over the radio as altitude. (see QNH) (CAP413)
  • height is the elevation above a ground reference point, commonly the terrain elevation. In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from a specified datum; this is referred to over the radio as height, where the specified datum is the airfield elevation (see QFE) (CAP413)
  • Indicated altitude is the reading on the altimeter.
  • Pressure altitude is the elevation above a standard datum plane (typically, 1013.2 millibars). Pressure altitude divided by 100 feet is referred to as the flight level; so when the altimeter reads 18,000 ft on the standard pressure setting the aircraft is said to be at "Flight level 180". Below FL180, altitudes are read in thousands, pronounced "one three thousand" for 13,000, "seven thousand" for 7,000 etc.
  • Density altitude is the altitude corrected for non-ISA International Standard Atmosphere (ISA) conditions at which the air density is unequal to ISA conditions. Aircraft performance depends on density altitude, which is affected by barometric pressure and temperature. On a very hot day, density altitude at an airport may be so high as to preclude takeoff, particularly for helicopters or a heavily loaded aircraft.
  • Absolute altitude is the height of the aircraft above the terrain over which it is flying.

For considerations of sea level change, in particular rise associated with possible global warming, see sea level rise. ... QNH is a Q code. ... Height is a measurement of the distance from the bottom to the top of something which is upright. ... QFE is a three letter acronym which can have meanings in aviation, in software development, and in internet usage. ... In aviation, pressure altitude is the indicated altitude when an altimeter is set to 1013 hPa (29. ... In aviation, a flight level is the nominal altitude of an aircraft referenced to a standard pressure datum, as opposed to the real altitude above mean sea level. ... Density altitude is the altitude in the International Standard Atmosphere at which the air density would be equal to the actual air density at the place of observation. ... Temperature and air pressure can vary from one place to another on the Earth, and can also vary in the same place with time. ...

Altitude regions

Mountain medicine recognizes three altitude regions: (Non-Physician Altitude Tutorial)

  • High altitude = 1500 m – 3500 m
  • Very High altitude = 3500 m – 5500 m
  • Extreme altitude = 5500 m – above

Travel to high altitudes leads to a range of medical problems, from the relatively mild symptoms of acute mountain sickness to the potentially fatal high altitude pulmonary oedema (HAPE) and high altitude cerebral oedema (HACE). These conditions are caused by the profound hypoxia associated with travel to high altitudes. Altitude sickness, also known as acute mountain sickness (AMS) or altitude illness is a pathological condition that is caused by lack of adaptation to high altitudes. ... High altitude pulmonary edema (HAPE) is a life threatening form of non-cardiogenic pulmonary edema that occurs in otherwise healthy mountaineers at altitudes above 2500m. ... High altitude pulmonary edema (HAPE) is a life threatening form of non-cardiogenic pulmonary edema that occurs in otherwise healthy mountaineers at altitudes above 2500m. ... High altitude cerebral edema (or HACE) is a severe (frequently fatal) form of altitude sickness. ... Cerebral edema is swelling of the brain which can occur as the result of a head injury, cardiac arrest or from the lack of proper altitude acclimatization. ...



The Earth's atmosphere is divided into several altitude regions: (Layers of the Atmosphere) Layers of Atmosphere (NOAA) Air redirects here. ...

View of Earths troposphere from an airplane. ... In tourist areas, the equator is often marked on the sides of roads The Equator is an imaginary circle drawn around a planet (or other astronomical object) at a distance halfway between the poles. ... Atmosphere diagram showing stratosphere. ... The mesosphere (from the Greek words mesos = middle and sphaira = ball) is the layer of the Earths atmosphere that is directly above the stratosphere and directly below the thermosphere. ... The thermosphere is the layer of the Earths atmosphere directly above the mesosphere and directly below the exosphere. ... [fAgot png|thumb|200px|right|Atmosphere diagram showing the exosphere and other layers. ...

References

    December 22 is the 356th day of the year (357th in leap years) in the Gregorian Calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... December 22 is the 356th day of the year (357th in leap years) in the Gregorian Calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... August 8 is the 220th day of the year in the Gregorian Calendar (221st in leap years), with 145 days remaining. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ...

    External links

    January 25 is the 25th day of the year in the Gregorian calendar. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ...

    See also


      Results from FactBites:
     
    Altitude - definition of Altitude in Encyclopedia (332 words)
    Altitude is the elevation of an object from a known level or datum, called zero level.
    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.
    In astronomy and surveying, altitude is one of the two coordinates of the horizontal coordinate system, and refers to the vertical angle from the horizon.
    Altitude - Wikipedia, the free encyclopedia (636 words)
    Altitude is the elevation of an object from a known level or datum.
    Above a transition altitude, which varies by nation, pressure altitude is used to set the altimeter.
    Density altitude is the altitude in the International Standard Atmosphere (ISA) at which the air density is equal to local conditions.
      More results at FactBites »

     
     

    COMMENTARY     


    Share your thoughts, questions and commentary here
    Your name
    Your comments

    Want to know more?
    Search encyclopedia, statistics and forums:

     


    Press Releases |  Feeds | Contact
    The Wikipedia article included on this page is licensed under the GFDL.
    Images may be subject to relevant owners' copyright.
    All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
    Usage implies agreement with terms, 1022, m