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

submitted 4 months ago by doomi@discuss.tchncs.de to c/spacex@sh.itjust.works

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[–] doomi@discuss.tchncs.de 3 points 4 months ago (1 children)

That’s what they said in the interview. And didn’t Apollo also had a pure oxygen environment? As long as there isn’t a spark it wouldn’t combust, right?

[–] fayoh@sopuli.xyz 3 points 4 months ago (1 children)

Even the command module was pure oxygen at 5 psi. There was the Apollo 1 fire, but otherwise I don't remember that there were any major issues.

[–] Morphit@feddit.uk 3 points 4 months ago (1 children)

The pressure in the Apollo 1 capsule was 16.7 PSI or 1.14 atmospheres of pure oxygen. That's almost 5.5 times the partial pressure of oxygen at sea level. At 5 PSI, the Polaris crew will only be at 1.6 times the partial pressure of oxygen at sea level.

[–] fayoh@sopuli.xyz 2 points 4 months ago (1 children)

You're right, the Apollo 1 was significantly higher pressure. Didn't know that. 😲 Makes somewhat more sense they could keep a pure oxygen atmosphere even after the accident.

Also, calculating partial pressures in psi is really annoying.

[–] threelonmusketeers@sh.itjust.works 2 points 4 months ago

kPa and Bar are obviously superior units!