I just wanted to calculate the theoretical time span in which I could survive (conscious) in my apartment without letting the air on the inside exchange oxygen/carbon dioxide with fresh air. During my calculations I came to the point where I was unsure, if the oxygen amount already consumed, influences the future O2 absorption and consequently the CO2 production.
In this hypotetical scenario, I assume that the air in my apartment is homogeneous and ideally mixed, thus measuring the same level of oxygen anywhere on the inside. Furhter I assume that all of my rooms are completely empty, hence having volume of the living space * room height * oxygen concentration as my initially available oxygen amount. (I tried to be independent of the air pressure by using standard values for consumption depending on concentration and calculate how long it would take for the oxygen level to drop below/carbon dioxide to rise above a specific threshol (depending on what gets lethal first) ).
I asked this particular question and not "How long can one survive in a closed room...", because I have not found a useful answer yet considering the oxygen/carbon dioxide concentration, but the absolute amount of these gases in it.
In case it would be helpful/necessary: I am not familiar with biochemical, metabolic reactions and have not studied in this field before.
Thanks in advance.
PS: If you think, another stackexchange community would be more appropiate, please comment.