Originally Posted by neilzero

Ne is neon which could be used, but I don't think neon is ever used for breathing. N is nitrogen.
I agree, 7 psi in a space suit would make movement difficult. Wickipedia says 4.7 psi. If 4.3 psi is correct, that accounts for the astronaught wareing the suit for a while before the EVA to get most of the nitrogen out of the lungs and suit. 100% oxygen may be close, but not correct as there needs to be some water vapor. The 5.3 KPa (40torr) of carbon dioxide seems way high, even for the maximum allowed. The 6.3 KPa (47 torr) of water vapor likely exceeds 100% relative humidity, so that number is also suspicious. 6.89 KPa per psi agrees with my calculator. Pa must be new terminology as it is not in my 1976 conversion tables. One torr = one millimeter of mercury. If you guys can invent a few thousand new units of measurements, we can confuse everyone with an IQ under 150. Neil