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Re: CO2 and agitation

Paul sears points out:

> 	The 350 ppm in air is 350 ppm by volume, which is the normal way
>  of expressing it with gases.  The concentrations in the tank are by weight.
>  If I recall correctly, the equilibrium concentration of CO2 in water in
>  contact with the atmosphere is something like 0.5 to 1 ppm, so if we
>  have 15 ppm in the water, that would require several thousand ppm in
>  the air for equilibrium.

I'm not sure, but I suspect that if you counted the dissolved gases in the 
water, about 350 ppm would turn out to be CO2.  This is how the equilibrium 
concentration is established (by nature, not by scientists.  They have their 
own,very complicated ways of going about it).

Bob Dixon