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]
^ abCite error: The named reference Landis was invoked but never defined (see the help page).
^"NASAexplores Glossary". Archived from the original on 2007-09-27.
^"NAHF – Harry Armstrong". November 18, 2007. Archived from the original on 2007-11-18.
The Armstronglimit or Armstrong's line is a measure of altitude above which atmospheric pressure is sufficiently low that water boils at the normal temperature...
Harry Armstrong may refer to: Harry George Armstrong (1899–1983), U.S. Air Force surgeon who first described the ArmstrongLimit Harry Armstrong (politician)...
medicine. The Armstronglimit, the altitude above which water boils at the temperature of the human body, is named after him. Armstrong served in the...
definition, but typically refers to the region roughly between the Armstronglimit (about 62,000 ft or 19 km, above which humans require a pressure suit...
avoided and treated by breathing supplementary oxygen, within limits. Above the Armstronglimit, the atmospheric pressure is sufficiently low that exposed...
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atmosphere Low atmospheric pressure (about 1% of Earth's; well below the Armstronglimit) Ionizing solar and cosmic radiation at the surface Average temperature...
such as high-altitude reconnaissance flight. At altitudes above the Armstronglimit, around 19,000 m (62,000 ft), water boils at body temperature and pressurized...
Armstronglimit). In "classical limit", "limit" is used in the sense of a limiting process. (Note that there is no simple rigorous mathematical limit...
of the human body. This altitude is known as the Armstronglimit. Exposure to pressure below this limit results in a rapid loss of consciousness, followed...
suit. The lowest pressure the human body can tolerate, known as the Armstronglimit, is the pressure at which water boils (vaporizes) at the temperature...
survival requires a still-higher pressure of at least 6.3 kPa, the Armstronglimit; below this pressure, exposed body fluids boil at body temperature...
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used to vent gas to control the ascent. Shortly after passing the Armstronglimit, Baumgartner expressed concerns that his visor heater was not functioning...
outside air pressure. Above 19,000 m (62,000 ft), also known as the Armstronglimit, fluids in the throat and lungs will boil away. Generally, 100% oxygen...
altitude is known as Armstrong's Line. Ebullism occurs when unprotected humans are exposed to altitudes above the Armstronglimit where the vapor pressure...
prior to the TUC as this induces an oxygen debt prior to exposure. Armstronglimit maximum survivable altitude Cabin pressurization Pressure suit Uncontrolled...
pressure.[citation needed] Above 19,000 m (62,000 ft), known as the Armstronglimit, exposed fluids in the throat and lungs will boil away at normal body...
temperature. This measure of altitude is known as the Armstronglimit, which is the practical limit to survivable altitude without pressurization. Fictional...
the Kármán line. The crew cabin peaked approx. 70,000 ft (above the Armstronglimit). 7 Tatyana Kuznetsova Jul. 14, 1941 died Aug. 23, 2018 Soviet Union...
Landis served as Armstrong's lieutenant, or chief domestique, pushing the pace in the mountains to break the pack before Armstrong took off on his own...
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