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CO2 PPM in tank / PPM in equlibrium atmosphere


The number of 20 or so PPM of C02 sticks in my mind as what I've seen
thrown around as target level for a planted tank. What is this
concentration as expressed relative to the ratio of air in the tank. Or to
say in another way, what is atmospheric concentration of C02 that would
produce a 20 ppm level in water in a system in equilibrium, assuming no
production or consumption of CO2.