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May 22, 2012 at 17:41 comment added bk0 I know everybody says "if gravity is stable over several days, it's done" but that strongly suggests to newbies that they should be checking gravity every day, which is a bad idea IMO.
May 22, 2012 at 14:41 comment added CaffeCaldo Upvoted. I would add that a) if the gravity reading is unchanging over a period of time (eg, 7 days) that fermentation has essentially stopped, and b) common sense suggests that unfermented wort will be denser / thicker / have a higher gravity than plain tap water, ergo the hydrometer should bob high the day the yeast is pitched, and sink low when fermentation is done. If the gravity is genuinely increasing over time, then something else is going on (eg, evaporation, which shouldn't happen unless you're doing open fermentation).
May 22, 2012 at 13:34 history edited mdma CC BY-SA 3.0
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May 22, 2012 at 13:12 comment added jsled Also, note that specific gravity should be corrected for temperature; most hydrometers are calibrated for 59°F.
May 22, 2012 at 13:01 history answered mdma CC BY-SA 3.0