I calculate (OG-FG)*0,132 to get % alcohol by volyme. This formula is approved by the Swedish Tax. But I have seen breweries calculate with 0,127 and this website has a calculator which use 0,130. Should I revise my calculation?
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Calculation of Alcohol streangth
(OG-PG) x f = %ABV
"The value of 'f' is not constant because the yeild of alcohol is not constant for all fermentations. In lower streangth beers, more of the sugars available for fermentation are consumed in yeast reproduction than in producing alcohol"
Some factors produced by the Lab of Goverment chemist(U.K.)
(OG - PG)..... %ABV ......Factor
10.5 - 17.2.. 1.3 - 2.1 ... 0.127
26.2 - 36.0 .. 3.3 - 4.6 ... 0.129
36.1 - 46.5.. 4.6 - 6.0 ... 0.130
57.2 - 67.9.. 7.5 - 9.0 ... 0.132
Recommend you verify your calculation with an analysis of your beer on a regular basis. (e.g., once a year)
mattLast edited by matt; 02-16-2004, 06:37 PM.
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Interesting!
I use the following from "Malting and Brewing Science":
(Og-Fg)X .516 with gravity measured in *Plato.
Interesting there is controversy on this. Remember though, that final reading is apparent extract and not real. I was using a rounded .52 but switched. Anyways, for a pub brewer its close enough!Brewmaster, Minocqua Brewing Company
tbriggs@minocquabrewingcompany.com
"Your results may vary"
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