In article ,
Were all the Apollo flights made in a one-gas (pure oxygen)
environment? It seems that the thin skin of the LM made it necessary
to limit the cabin pressure to 3.5 psi and required a one-gas system.
That, plus the need to do spacewalks without lengthy prebreathing, plus
the much greater complexity of two-gas life-support systems.
Post-fire, Apollo used 60% oxygen 40% nitrogen as the *cabin* atmosphere
on the pad, but the crew always breathed pure oxygen, and the cabin
shifted to pure oxygen during ascent.
MOST launched 30 June; science observations running | Henry Spencer
since Oct; first surprises seen; papers pending. |