Beer measurement#By strength

Beer measurement#By strength

Beer ranges from less than 3% alcohol by volume (abv) to around 14% abv, though this strength can be increased to around 20% by re-pitching with champagne yeast,[99] and to 55% abv by the freeze-distilling process.[100] The alcohol content of beer varies by local practice or beer style.[101] The pale lagers that most consumers are familiar with fall in the range of 4–6%, with a typical abv of 5%.[102] The customary strength of British ales is quite low, with many session beers being around 4% abv.[103] Some beers, such as table beer are of such low alcohol content (1%–4%) that they are served instead of soft drinks in some schools.[104]

The alcohol in beer comes primarily from the metabolism of sugars that are produced during fermentation. The quantity of fermentable sugars in the wort and the variety of yeast used to ferment the wort are the primary factors that determine the amount of alcohol in the final beer. Additional fermentable sugars are sometimes added to increase alcohol content, and enzymes are often added to the wort for certain styles of beer (primarily "light" beers) to convert more complex carbohydrates (starches) to fermentable sugars. Alcohol is a by-product of yeast metabolism and is toxic to the yeast; typical brewing yeast cannot survive at alcohol concentrations above 12% by volume. Low temperatures and too little fermentation time decreases the effectiveness of yeasts and consequently decreases the alcohol content.







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