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Alcohol proof (usually termed simply "proof" in relation to a beverage) is a measure of the content of ethanol (alcohol) in an alcoholic beverage. The term was originally used in England and from 1816 was equal to about 1.75 times the percentage of alcohol by volume (ABV).
In the United Kingdom, proof is 1.75 times the number (expressed as a percentage). [23] [20] For example, 40% alc/vol is 80 proof in the US and 70 proof in the UK. However, since 1980, alcohol proof in the UK has been replaced by alc/vol as a measure of alcohol content, avoiding confusion between the UK and US proof standards. [citation needed]
The concentration of alcohol in a beverage is usually stated as the percentage of alcohol by volume (ABV, the number of milliliters (ml) of pure ethanol in 100 ml of beverage) or as proof. In the United States, proof is twice the percentage of alcohol by volume at 60 degrees Fahrenheit (e.g. 80 proof = 40% ABV).
In countries without labeling, it is possible to calculate the pure alcohol mass in a serving from the concentration, density of alcohol, and volume: = For example, a 350 ml (12 US fl oz) glass of beer with an ABV of 5.5% contains 19.25 ml of pure alcohol, which has a density of 0.78945 g/mL (at 20 °C), [ 32 ] and therefore a mass of 15.20 ...
A basic formula [4] to calculate beer strength based on the difference between the original and final SG is: = 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 volume of such a mixture is slightly less than the sum of the volumes of the components. Thus, by the above definition, the term "40% alcohol by volume" refers to a mixture of 40 volume units of ethanol with enough water to make a final volume of 100 units, rather than a mixture of 40 units of ethanol with 60 units of water.
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Originally there were different standard gallons depending on the type of alcohol. That meant that the Reputed measures varied depending on which standard gallon was used. A Reputed Pint of beer was equal to 285 mL (1/2 an Ale Pint, or equivalent to 10 imperial oz. or 9.63 US oz.) and a Reputed Quart of wine was equal to 730 mL (3/4 of a Wine ...