What is the vacuum at the Karman line?

In summary, there is conflicting information about the vacuum at the Karman line (100km straight up). While one source states it is approximately 2.4*10^(-4)T, another chart suggests it is between 1.09 and 0.0075 Torr. However, based on a different chart, the pressure at this altitude is most likely around 0.03 Pa or 2*10^(-4) torr. It is important to note that the torr entry in the chart may be incorrect.
  • #1
mesa
Gold Member
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Hey guys, what is the vacuum at the Karman line (100km straight up).

I found conflicting sources on this. Wikipedia links to a calculator that states it is ~2.4*10^(-4)T, while another chart I found says it is in between 1.09 and .0075 Torr:

http://www.orbitec.com/documents/Orbitec_Vacuum_Reference.pdf

I always thought it was around 10^(-3)T.

Any help would be appreciated!
 
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  • #2
That calculator is massively wrong for high altitudes, the other two calculators linked here don't allow those heights.

Going by this chart, pressure is 0.03 Pa or 2*10-4 torr.
Note that the graph agrees well with the "mm Hg" and kg/(sq cm) columns for 45 km and 200 km. The torr entry in the 200 km row seems to be wrong, it does not agree with mm Hg column.
 

What is the vacuum at the Karman line?

The vacuum at the Karman line refers to the atmospheric pressure at an altitude of 100 kilometers above the Earth's surface, which is considered the boundary between Earth's atmosphere and outer space.

Why is the Karman line significant?

The Karman line is significant because it is used as the internationally recognized boundary for determining whether an object has reached outer space. It is also used as a reference point for the altitude at which a spacecraft can achieve orbit.

What is the vacuum like at the Karman line?

The vacuum at the Karman line is extremely low, with a pressure of approximately 10^-7 Pascal. This means that there are very few gas molecules present, making it difficult for any spacecraft or object to maintain lift or propulsion.

How does the vacuum at the Karman line affect space travel?

The vacuum at the Karman line presents challenges for space travel, as it requires spacecraft to be designed to withstand the low pressure and lack of air resistance. It also means that astronauts must wear pressurized suits to survive in this environment.

What happens if an object reaches the Karman line?

If an object reaches the Karman line, it is considered to have entered outer space and will experience the effects of microgravity. It will also have a clear view of the Earth and the stars, and will be able to orbit the Earth if it has enough speed and momentum.

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