Originally Posted by smokinghole
Actually 1 point of gravity gives you approximately .5 volumes of CO2. I keep hearing that brett gives .5 to .75 vol CO2 compared to Sacch. So at 1.003 he could expect 1.5 volumes with sacch only and possibly only .75 to ~1.125 volumes with the Brett taking it all the way down to 1.000. I just wish I had a cheap way to measure the dissolved CO2 in my bottles when I pop them.
Just checked Palmer's Nomograph to see who is correct. It seems it is somewhere in between.
From the Nomograph. At 65 F:
1.5 volumes = 1.4 ozs table sugar
3 volumes = 4.8 ozs tble sugar
Using the difference of the two, 3.4 ozs table sugar = 1.5 volumes in 5 gallons. I'm using the difference to eliminate the effects of entrained CO2 in the wort. It will also eliminate any temperature effects.
1 lbs sugar = 46 gravity points. Therefore 3.4 ozs = 9.775 gravity points. In 5 gallons, 1.5 volumes of CO2 = .001955, or .002 gravity change.
Based on this. .003 gravity change will = 2.25 volumes of CO2.
I don't think there is any difference between Sacc and Brett in generating CO2 for a given gravity change. Only problem is; the Brett will keep on fermenting some of the sugars Sacc will not, so he will end up with a higher CO2 content for the same sugar addition.