Need to take 3 hydrometer readings during brew process. One during the sparge process, One after boil, previous to fermentation and the last one after fermentation is complete. Need to add .015 during sparge do the water being 15o degrees.
Original Gravity = beer before fermentation.
Final Gravity = beer after fermentation.
measuring alcohol by volume
ABV = (Orig_gravity - Final_gravity) * 131
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