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Because ABW measures the proportion of the drink's mass which is alcohol, while alc/vol is the proportion of the drink's volume which is alcohol, the two values are in the same proportion as the drink's density is with the density of alcohol. Therefore, one can use the following equation to convert between ABV and ABW:
A basic formula [4] to calculate beer strength based on the difference between the original and final SG is: A B V = 131.25 ( O G − F G ) {\displaystyle ABV=131.25(OG-FG)} The formula below [ 5 ] is an alternate equation which provides more accurate estimates at higher alcohol percentages (it is typically used for beers above 6 or 7%).
The term was originally used in England and from 1816 was equal to about 1.75 times the percentage of alcohol by volume (ABV). The United Kingdom today uses ABV instead of proof. In the United States, alcohol proof is defined as twice the percentage of ABV. The definition of proof in terms of ABV varies from country to country.
With typical values of 1.050 and 1.010 for, respectively, OG and FG this simplified formula gives an ABV of 5.31% as opposed to 5.23% for the more accurate formula. Formulas for alcohol similar to this last simple one abound in the brewing literature and are very popular among home brewers.
In chemistry, an alcohol (from Arabic al-kuḥl 'the kohl'), [2] is a type of organic compound that carries at least one hydroxyl (−OH) functional group bound to a saturated carbon atom. [ 3 ] [ 4 ] Alcohols range from the simple, like methanol and ethanol , to complex, like sugars and cholesterol .
In Canada, regular beers typically have 5% ABV, while a reduced-alcohol beer contains 2.6%–4.0% ABV and an "extra-light" beer contains less than 2.5%. [21] In the United States, most mass-market light beer brands, including Bud Light, Coors Light, and Miller Lite, have 4.2% ABV, less than ordinary beers from the same makers which are 5% ABV. [19]
The third paragraph of this section states: "At relatively low ABV, the alcohol percentage by weight is about 4/5 of the ABV" Should it be ABV is 4/5 of ABW instead? Chaozu42 23:33, 1 May 2009 (UTC) According to the reference given in the article, the text is correct as it stands. 4% ABV beer is equivalent to 3.2% ABW beer.
Most countries have laws regulating the production, sale, and consumption of alcoholic beverages. [1] Some regulations require the labeling of the percentage alcohol content (as ABV or proof) and the use of a warning label. Some countries ban the consumption of alcoholic drinks, but they are legal in most parts of the world.