Corrected entry: Upon reentry, a crew member comments that the atmosphere is like "breathing through an exhaust pipe, CO2 is over 3%, two minutes without a suit and you're dead." However, human beings can live in an environment of over 5% CO2, with only mild discomfort in the 3% range.
lionhead
23rd Jun 2012
Correction: They're just rattling off a list of details about the atmosphere, concluding with the fact that it will kill you. Its lethal toxicity is not to do with the CO2 levels.
Phixius ★
"Not to do with the CO2 levels"? Read the quote. They're saying you'll die in minutes from exposure to 3% CO2. That would make mouth-to-mouth resuscitation an impossibility as we exhale about 4% CO2. Even if they meant carbon monoxide - ie. What comes out of an exhaust pipe - you'd still have have to be WELL over 3% concentration for it to be lethal within minutes.
The quote does say the atmosphere is over 3%, not at 3%. Could be 6%.
lionhead
It's unlikely after saying 71% nitrogen and 21% oxygen that "over 3%" would mean double the amount. Over 3% would mean less than 4%. But I would like to know what studies shows humans surviving over 5% CO2 levels to see what the rest of the air is made up of.
Bishop73