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I believe the weight of CO2 expelled pretty much exactly explains the change in weight and so in specific gravity. My 23 litre (30 bottle) wine bucket started with an SG of 1.074 so would have weighed 24.7kg (54.4 lbs). If it finishes at an SG of 1.000, it will then weigh 23kg so will have lost 1.7kg (3.7 lbs) of CO2. Volume is slightly trickier. One Mol of ...

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