Fri, Feb 20, 2009
Aero-Terms!
Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
Suggestions for future Aero-Terms are ALWAYS
welcome, as are additions or discussion of the
explanations given for each Aero-Term.
Armstrong Limit
Often called Armstrong's Line, is the altitude that produces an
atmospheric pressure so low (0.0618 atmospheres), that water boils
at the normal temperature of the human body: 37 °C (98.6
°F). It is named after US Air Force surgeon Harry George
Armstrong, who first described it. The altitude is variously
reported as being between 18.9-19.4 km (62,000-63,500 feet or about
11.8 miles). At or above this point, exposed human fluids will
boil without a pressure suit, and no amount of breathable oxygen,
delivered by any means, will sustain life for more than a few
minutes. A human would, eventually, boil in their own body fluids
(a process known as ebullism), though death from asphyxiation would
occur first, as the barrier of the skin and control of blood
pressure would prevent blood from boiling immediately.
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