Armstrong limit
Armstrong Limit
The Armstrong Limit (pronounced: /ˈɑːrmstrɒŋ ˈlɪmɪt/), also known as Armstrong's Line, is a measure of atmospheric pressure in the field of Aerospace Medicine. It is named after Harry George Armstrong, an American physician who was a pioneer in the study of the physiological and psychological effects of high altitude flight.
Etymology
The term "Armstrong Limit" is derived from the name of its discoverer, Dr. Harry George Armstrong. He was the founder of the United States Air Force's School of Aerospace Medicine and made significant contributions to understanding the human body's response to the extreme conditions encountered at high altitudes.
Definition
The Armstrong Limit refers to the altitude above the Earth's surface at which the atmospheric pressure falls to approximately 6.3 kPa (47 mm Hg), or about 1/16th of the pressure at sea level. At or above this altitude, water boils at the temperature of the human body, and exposed bodily fluids such as saliva, tears, and the liquids in the lungs start to boil at body temperature.
Related Terms
- Atmospheric Pressure: The pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101.325 kPa (760 mm Hg).
- Aerospace Medicine: The medical specialty concerned with the determination and maintenance of the health, safety, and performance of individuals involved in air and space travel.
- Barometric Pressure: Another term for atmospheric pressure.
- Hypoxia (medical): A condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. Hypoxia can be a result of high altitude conditions, such as those above the Armstrong Limit.
See Also
External links
- Medical encyclopedia article on Armstrong limit
- Wikipedia's article - Armstrong limit
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