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HOMEBREW Digest #5693
HOMEBREW Digest #5693 Mon 07 June 2010
FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
Digest Janitor: pbabcock at hbd.org
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Contents:
Brix to Specific Gravity Calculations (Jim Stansell)
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Date: Mon, 07 Jun 2010 15:34:16 -0400
From: Jim Stansell <jim.stansell at comcast.net>
Subject: Brix to Specific Gravity Calculations
I've searched through the HBD archives as well as other online
sources and have found several formulas for converting brix to
specific gravity of raw wort.
(1) SG = ((Brix-1.6)/220)+1
(2) SG = (260/(260-(Brix/1.04)))
(3) SG =
1.000019+0.003865613*(Brix)+0.00001296425*(Brix^2)+0.00000005701128*(Brix^3)
(4) SG =
1.000898+0.003859118*(Brix)+0.00001370735*(Brix^2)+0.00000003742517*(Brix^3)
The first two are both linear, and my impression was that the
relationship (although close) wasn't linear, so I assume that these
are approximations.
The remaining two are certainly close, although the last one always
produces a result for SG that's 0.0009 higher at each brix reading
(BTW, it's not exactly the same difference every time, but it always
rounds to 0.0009).
Finally, when I plug various brix readings into ProMash, I come up
with different SGs.
For example:
(3) (4) ProMash
6.0 brix 1.02369 1.02455 1.02277
9.0 brix 1.03590 1.03677 1.03448
12.0 brix 1.04837 1.04925 1.04644
18.0 brix 1.07413 1.07502 1.07110
Is there a preferred (i.e., most accurate) version or are they all
close enough to each other to be acceptable substitutes?
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End of HOMEBREW Digest #5693, 06/07/10
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