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5

Bottom line: its impossible for the gravity to decrease during boil. You only evaporate water, leaving an increasingly sugary solution. So there is an error with your preboil postboil or both gravity readings. Most common reasons for incorrect readings: Incomplete Mixings Failure to to a temperature adjustment Related to the second - Uncalibrated ...


3

I guess you're assuming the sample will continue to ferment with suspended yeast? There's quite a few reasons why this can fail: the sample may not be at the same temperature as the beer (both due to it's location plus it lacks the exothermic heat produced from the large volume of yeast in the main ferment.) the sample may become contaminated and ferment ...


3

If the trub is actually physically holding the hydrometer up, preventing it from moving down, then unambiguously: yes, the trub will render your hydrometer reading useless. If, on the other hand, the trub is suspended in the liquid, it is a mixed bag. Suspended solids will impact a hydrometer reading, but for brewers it is usually very minimal. The only ...



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