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Everyday Astronaut: Interview with the Polaris Dawn Crew (youtu.be)

submitted 6 months ago by [email protected] to c/[email protected]

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[–] bcoffy 6 points 6 months ago (1 children)

Pretty much all modern EVA suits (like the ones used by US, China, Russia) run a pure oxygen at about .20 ATM so that the internal pressure is lower but the amount of oxygen the astronaut is breathing is the same density of oxygen as at 1 ATM. This allows much better maneuverability in the space suit, because any air mixture at 1 ATM makes it nearly immediately to move in a space suit (they become too stiff).

Point is, we have been doing spacewalks like this since spacewalks started and no one has spontaneously combusted on one.

[–] [email protected] 4 points 5 months ago* (last edited 5 months ago)

Ok fair enough. My dilettante knowledge of chemistry let me down.

A little bit of knowledge is a dangerous thing, unlike pure oxygen at only a little bit of pressure.