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Re: [APD] Just hot air?

Quoting Stuart Halliday <stuart at mytriops_com>:

> Shame we can't just use a bag of collected exhaled breath and put a weight
> on top of it to slowly eject it into our tanks. That'd be cheap.
> A bit like a bagpipe, without the music?
> Hmm I wonder if this is practical?
> Anyone tried it?

I seem to remember, but cannot now find a reference, that the partial  
pressure of CO2 in exhaled breath is relatively small compared to the  
partial pressure of CO2 in air. Probably not worth the effort.

(I could dig up the average numbers, if there were sufficient interest.)
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