Originally Posted by aqua_chem
That being said, there is a noticeable caveat with DIY CO2
. When you first start your batch, the entire CO2
fermenter (and any gas separator you use) will be filled with atmosphere, which is 80% nitrogen, 20% oxygen (and much smaller percents other things), which is all insoluble. CO2
is denser than either of those, so your reactor will initially release those two gases until the entire space has been replaced by CO2
, after which point it will mostly be pure CO2
is denser, but its density is negligible since it will immediately start to diffuse and mix with the other gases, and standard gravity is not a strong enough force to overcome the kinetic forces of gaseous molecules. Gases of different densities won't stratify at standard gravity, instead they gradually spread until the space is evenly occupied.
Not that it matters, though (just thought it was worth mentioning). The effect is the same: slow-dissolving N2 and O2
getting "trapped" in the reactor.
Sent from my iPhone using Aquarium Advice