Back حد آرمسترونغ Arabic Armstrong-Grenze German Límite de Armstrong Spanish Armstrongi piir Estonian Armstrongen muga Basque حد آرمسترانگ Persian Limite Armstrong French Armstrong-vonal Hungarian Batas Armstrong ID Limite di Armstrong Italian

Armstrong limit

The Armstrong limit is above most of Earth's atmosphere.

The Armstrong limit or Armstrong's line is a measure of altitude above which atmospheric pressure is sufficiently low that water boils at the normal temperature of the human body. Exposure to pressure below this limit results in a rapid loss of consciousness, followed by a series of changes to cardiovascular and neurological functions, and eventually death, unless pressure is restored within 60–90 seconds.[1] On Earth, the limit is around 18–19 km (11–12 mi; 59,000–62,000 ft) above sea level,[1][2] above which atmospheric air pressure drops below 0.0618 atm (6.3 kPa, 47 mmHg, or about 1 psi). The U.S. Standard Atmospheric model sets the Armstrong limit at an altitude of 63,000 feet (19,202 m).

The term is named after United States Air Force General Harry George Armstrong, who was the first to recognize this phenomenon.[3]

  1. ^ a b Cite error: The named reference Landis was invoked but never defined (see the help page).
  2. ^ "NASAexplores Glossary". Archived from the original on 2007-09-27.
  3. ^ "NAHF – Harry Armstrong". November 18, 2007. Archived from the original on 2007-11-18.

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