Physics, chemistry and biology of brewing. The causes and the effects.

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Postby Okami » Mon Jun 11, 2001 2:45 pm

My first fruit beer is in the final fermenter
and I was wondering if anybody could help me
calculate the ABV for it. I used the "finished
beer analysis" on this site, but that doesn't
account for the sugar in the fruit. I have a
feeling that much math is involved.
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when did you add the fruit?

Postby xbrewer » Sun Jun 17, 2001 10:39 pm

If you added the fruit before you took your initial hydrometer reading, the " finished beer analysis" would probably be accurate. If you added the fruit during secondary fermentation, the calculations would be more involved. I've forgotten much of the mathmatics I learned 30 years ago, but I can tell you that it would involve taking a hydrometer reading and volume measurement of fruit juice added and factoring these into your calculations. Unfortunately, I can't give you a formula. I doubt that the added fruit would have a significant effect on the alcohol content unless you added a very large volume of fruit. I myself don't usually concern myself with alcohol content calculations, though it is often the first thing most people seem to want to know about my homebrews.
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