tibby

No idea about the chemistry involved but all references (including Rebreather manuals) I've read state that 1l of O2 produces ~0.9l of CO2.

I think there are even references about the CO2 absorbtion capacity of the different sorb brands out there so you can calculate scrubber duration based on O2 consumption. I assume this is why you asked this question to begin with.

I remember reading a post by Joe Radomski here on Rebreather World showing such a calculation. The only thing that puzzled me was that he used the entire weight/volume of the scrubber as part of the equation and I would think that a scrubber would reach breakthrough quite some time before using the entire sorb in the can. Of course I'm a newby and Joe is very experienced (he wrote the manual I learned from) so take my assumption with a grain of salt.

Cheers,
Tibby

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Does the voice of reason change when you add helium to the mix?...hmm