Hydrometer: Difference between revisions
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Put your liquid in the hydrometer tube, spinning the hydrometer and measuring the original gravity (OG) when it settles. Try to make sure there is as little carbonation (bubbles) as possible in this process. Once you think it's done fermenting, take another measurement with the hydrometer for final gravity (FG). | Put your liquid in the hydrometer tube, spinning the hydrometer and measuring the original gravity (OG) when it settles. Try to make sure there is as little carbonation (bubbles) as possible in this process. Once you think it's done fermenting (when the lavalamp-esque activity stops), take another measurement with the hydrometer for final gravity (FG). | ||
(OG - FG) * 105 = {% Alcohol by Weight} | (OG - FG) * 105 = {% Alcohol by Weight} | ||
Revision as of 11:49, 29 December 2005
Put your liquid in the hydrometer tube, spinning the hydrometer and measuring the original gravity (OG) when it settles. Try to make sure there is as little carbonation (bubbles) as possible in this process. Once you think it's done fermenting (when the lavalamp-esque activity stops), take another measurement with the hydrometer for final gravity (FG).
(OG - FG) * 105 = {% Alcohol by Weight}
{% Alcohol by Weight} * 1.25 = [% Alcohol by Volume]
If we take the first case from the Cider example, the OG was 1.050 and the FG was 1.006.
(1.050 - 1.006) * 105 = 4.62 4.62 * 1.25 = 5.775
Thus, the Cider with the EC1118 yeast has approximately 5.8% alcohol.
