What distance defines the Kármán line, the conventional boundary for aerodynamic flight?
Answer
100 kilometers above sea level
The Kármán line serves as the internationally recognized, conventional threshold separating the Earth's atmosphere from outer space. This line is officially set at an altitude of 100 kilometers, or about 62 miles, above sea level. It signifies the altitude where the atmosphere becomes too thin to support conventional aerodynamic flight, meaning that aircraft relying on airfoils can no longer generate sufficient lift. Although the ISS orbits considerably higher than this line, it is important to note that even at 100 kilometers, some trace amounts of atmospheric gas still exist.
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