More out of curiosity than anything, but I was wondering if anyone has found out how the gas composition changes within the carboy, assuming perfect seal and that it started out with regular air composition?
I know CO2 is heavier than O2. My theory is that as fermentation is happening, the CO2 produced forces the less dense O2 out of the airlock.
I guess I'm kind of interested to know, because this means that fermentation does it's own CO2 purge, which should mean that taking the airlock on and off, or testing the SG is less intrusive than it would be otherwise.
I know CO2 is heavier than O2. My theory is that as fermentation is happening, the CO2 produced forces the less dense O2 out of the airlock.
I guess I'm kind of interested to know, because this means that fermentation does it's own CO2 purge, which should mean that taking the airlock on and off, or testing the SG is less intrusive than it would be otherwise.