Kármán line | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_line


00:01:59 1 Kármán's comments
00:03:35 2 Definition
00:09:42 3 Interpretations of the definition
00:11:28 4 Alternatives to the definition
00:14:09 5 See also



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SUMMARY
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The Kármán line, or Karman line, is an attempt to define a boundary between Earth's atmosphere and outer space. This is important for legal and regulatory measures; aircraft and spacecraft fall under different jurisdictions and are subject to different treaties.
The Fédération aéronautique internationale (FAI; English: World Air Sports Federation), an international standard-setting and record-keeping body for aeronautics and astronautics, defines the Kármán line as the altitude of 100 kilometres (62 miles; 330,000 feet) above Earth's sea level. Other organizations do not use this definition. For instance, the US Air Force and NASA define the limit to be 50 miles (80 kilometres) above sea level for purposes of awarding personnel with outer space badges. There is no international law defining the edge of space, and therefore the limit of national airspace, and the US is resisting regulatory movement on this front.The line is named after Theodore von Kármán (1881–1963), a Hungarian American engineer and physicist, who was active primarily in aeronautics and astronautics. He was the first person to calculate at which altitude the atmosphere becomes too thin to support aeronautical flight and arrived at 83.6 km (51.9 mi) himself. The reason is that a vehicle at this altitude would have to travel faster than orbital velocity to derive sufficient aerodynamic lift to support itself. The line is approximately at the turbopause, above which atmospheric gasses are not well-mixed.  The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere.