When brewing beer, cider, or wine you are going to need to use a hydrometer. The hydrometer measures the amount of sugar that is dissolved in water. This sugar is what the yeast turns into alcohol during fermentation. By measuring the Original Gravity (OG) of your wort you can estimate the amount of alcohol that your wort can produce. By measuring the Final Gravity (FG) you can use the formula below to get your alcohol content in your now fermented beer.
(OG - FG) X 131 = ABV
From our blog - http://www.northernbrewer.com/connect/2015/12/whats-on-tap-hydrometers-for-beer-cider-and-wine-making/
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