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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Answers by country

100 km
50 km
150 km
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answers
flagthe Philippines
50%
0%
30%
20%
10
flagMalaysia
50%
0%
10%
40%
10
flagAustria
42%
7%
42%
7%
14
flagAustralia
41%
17%
17%
17%
17
flagPoland
40%
13%
30%
15%
1072
flagGermany
39%
18%
31%
11%
61
flagIndia
38%
11%
28%
20%
144
flagthe United States
30%
6%
36%
25%
82
flagthe United Kingdom
24%
13%
27%
34%
29