Asked by John

What provides pure O2 for inhaling and canisters to collect CO2
CO2.
Answered by DrBob222
You've left me out in the wild; give me something to get my bearings
Answered by John
The question is in reference to o2 canisters attached to space suites during space travel
Answered by DrBob222
I believe O2 is generated by the electrolysis of H2O. I don't think it is generated as needed on a space suit but in the space ship, stored in canisters, and the canisters and contents are attached to the space suit with astronaut inside. If they don't wear a space suit while in the ship the cabin has free flowing O2 gas that ultimately comes from H2O.
In early space flights LiOH was used to absorb CO2 but I believe the international space station uses a molecular sieve of zeolite.
The old method worked this way.
2LiOH + CO2 ==> Li2CO3 + H2O
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