Mead Lovers Digest #0207

Published in

· 8 months ago

 

Mead Lover's Digest #207                            Fri 17 September 1993 

 
        Forum for Discussion of Mead Brewing and Consuming 
               John Dilley, Digest Coordinator 

 
Contents: 
  accurate alcohol content (Ralph Snel) 
  Subscription (Paul Crowell) 
  subscribe (Stephen Dillinger) 

 
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Date: Thu, 16 Sep 93 16:06:11 METDST 
From: Ralph Snel <ralph@astro.lu.se> 
Subject: accurate alcohol content 

rcd@raven.eklektix.com (Dick Dunn) wrote: 
> 
>One last point: how would you measure "exact" alcohol content?  This is 
>tricky, particularly with residual sugar.  Alcohol and sugar both mess 
>around with specific gravity, boiling point, etc.; I don't know a good way 
>for a home zymurgist to get a single-measurement alcohol reading.  (I note 
>that Joyce writes from a place that sounds like it might have serious lab 
>equipment and procedures for making such measurements...if so, I'm still 
>interested in how it's done.) 

A quite simple way that will give accuracy up to 0.1% is to boil off 
_all_ the alcohol and substitute by water. This means boiling down to 
less than a third of the original volume in most cases, it's not that 
hard to smell if there are alcohols in the vapour. 
Fill with water so you have your original volume and take the difference 
in gravity. 
The following table is a part of a table that extends from 1 to 26 Oechsle 
SG. 

SG      Alcohol 
diff.   vol % 
10      7.18 
11      7.98 
12      8.80 
13      9.65 
14      10.51 
15      11.40 
16      12.30 
17      13.20 
18      14.10 
19      15.10 
20      16.00 
21      17.00 
22      18.00 
23      19.00 
24      20.00 
25      21.00 
26      22.00 

From: 'Technisch handboek voor de amateur wijn- en biermaker' 
by Leo van der Straten 
ISBN 90-245-0969-6 

I'm not sure how accurate the table is for the higher differences, 
but it suggests something around 0.1 vol% 

Ralph Snel 
ralph@astro.lu.se 

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Date: Thu, 16 Sep 93 14:07:10 MDT 
From: uranus!trojan!crowell@uunet.UU.NET (Paul Crowell) 
Subject: Subscription 

subscribe 

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Date: Thu, 16 Sep 93 14:00:49 MDT 
From: uranus!argus!dillinge@uunet.UU.NET (Stephen Dillinger) 
Subject: subscribe 

 

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