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they use whats known as a HYDOMETER is a glass object and it and its an instrument is an instrument used for determining the specific gravity (or the density) of liquids.

What you do is take a sample of your beer or wine after you've added sugar before it has yeast in it then after adding yeast and the end of it fermenting you take another reading. Subtract the last reading from the first then divided by 8 = the % alcohol by volume or something like that. Ive also read in a few places you subtract by 7.36 (the internets a funny place)

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Q: How do they work out how much alcohol you drank?
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