The atmosphere is about 78% N2 and only 0.05% CO2. So If you took all the oxygen out of a room, it would be mainly nitrogen left, and still only trace levels of CO2.
You will die before you produce enough CO2 to detect.
You actually don’t even need to breathe to do this. If you hyperventilate to expel the CO2 from your blood then hold your breath, you will run out of oxygen before you build enough CO2 up to detect.
What do you think is filling that oxygen-less box while the person breathes in it?
The atmosphere is about 78% N2 and only 0.05% CO2. So If you took all the oxygen out of a room, it would be mainly nitrogen left, and still only trace levels of CO2.
You will die before you produce enough CO2 to detect.
You actually don’t even need to breathe to do this. If you hyperventilate to expel the CO2 from your blood then hold your breath, you will run out of oxygen before you build enough CO2 up to detect.
https://en.wikipedia.org/wiki/Freediving_blackout
Will your body produce CO2 without having oxygen to break down in the first place?
You will have stored some amount of it that you will breathe out.
That’s not enough for your body to detect.
Gympie-Gympie leaves.