I had a thought about what the operating air pressure of the ISS would be. I was surprised to find it is 1 atmosphere or 14.7 psi.

Given that airliners fly in the lower atmosphere but pressurise cabins at about 11 or 12 psi (and fly at altitudes producing a pressure differential of a half atmosphere), what is the rationale for the ISS to maintain a whole atmosphere difference against the vacuum?

  • $\begingroup$ @called2voyage but none of those answers explain why the ISS is different to airliners in this regard $\endgroup$ – HorusKol Aug 24 '17 at 21:11
  • $\begingroup$ The top answer does. Of course, it says that the ISS does because Soviet spacecraft do, but it does explain their rationale. Now, if you want to compare Soviet spacecraft to airliners, that would be a new question. $\endgroup$ – called2voyage Aug 24 '17 at 21:16

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