A hydrometer is shown floating in a test tube full of wort, the sugar rich liquid that is fermented into beer. The hydrometer is measuring the specific gravity of the wort. Hydrometer readings before and after fermentation are used to determine alcohol content.
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alcohol ale beer brew brewer brewery brewing calculate cider close closeup content craft craftbrew density ferment fermentation float glass gravity home homebrew hydrometer instrument isolated lager liquid measure measurement microbrew plastic reading specific studio test tube volume white wine
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