What altitude represents the boundary between Earth's atmosphere and outer space?

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200 km
The Karman line is named after Theodore von Kármán, a Hungarian American engineer and physicist. He was the first person to calculate that the atmosphere around this altitude becomes too thin to support aeronautical flight, since a vehicle would have to travel faster than orbital velocity to derive sufficient aerodynamic lift to support itself.
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Very interesting!
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Answers by country

100 km
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answers
flagMalaysia
50%
0%
10%
40%
10
flagAustralia
46%
13%
13%
20%
15
flagGermany
43%
23%
19%
13%
46
flagPoland
40%
13%
30%
15%
956
flagIndia
38%
10%
29%
20%
126
flagthe United States
31%
6%
36%
25%
80
flagthe United Kingdom
20%
12%
25%
41%
24