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Hydrometer

An instrument for measuring the specific gravity (abbreviated as s.g.), relative to sugar content, of a liquid. The importance of s.g. rests in its indication of proofing potential. In other words, s.g. indicates how much dissolved sugar is present for conversion to alcohol by yeast, what that proof will be, and how much sugar to add to raise the finished proof to a specific level. A hydrometer which indicates the proof of the present alcoholic content is called a "proofing hydrometer."

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