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Yes, CO2 is heavier than air but - there exists a phenomenon called diffusion. Let?s asume, we got a chamber and in the middle of it is a horizontal wall which can be remowed. Than you fill the bottom part with pure CO2 and the upper part with air. Now remove the wall veeery slowly, so you dont disturbe the two gases. Now what will happen is, as an effect of the diffusion, some of the CO2 will diffuse(go) to the air layer and some of the air will diffuse into the CO2 layer. So what you will get is a gas mixture, with the highest CO2 concentration on the bottom and the lowest at the top. All this happens without disturbing the two layers from the outside in any way, it happens because of the velocity of the gas molecules. If you do some air exchange two or three times a day, than this contentration difference will be very small, this means the concentration of CO2 in the terrarium will be higher than outside but nearly equal in the whole terraruim.
------------------ It?s easy to do without silver and gold or even pleasures of love but its hard to do without mushrooms.
That's what I figured, so the appropriate answer is, CO2 levels inside a terrarium are effectivly equal at any point in the terrarium.
Which then leads to the fact, that an "exhaust" port location is irrelevant, so long as you get effective air exhange. This "exhaust" would be used during some type of forced air exchange via a mechanical pump type system.
Do I understand correctly?
"In theory, there is no difference between theory and practice. In practice, there always is."
As long as there is air flow (be it constant or complete exchange every day or so), the CO2 levels shouldn't affect grow very much. Unless you want to get really scientific and compare the growth between tissue clones under different CO2 levels, you won't notice much of a difference from batch to batch. I think it is very important, however, to monitor the humidity and temperature with extreme precision.
-------------------- Note: In desperate need of a cure...
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