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Alcohol proof is a measure of the content of ethanol (alcohol) in an alcoholic beverage. The term was originally used in the United Kingdom and was equal to about 1.75 times the alcohol by volume (ABV). The UK now uses the ABV standard instead of alcohol proof. In the United States, alcohol proof is defined as twice the percentage of ABV.
Concentration: Volume/Volume %. When the solute is a liquid sometimes it is convenient to express its concentration in volume/volume percent (v/v %). Wine has about 12 mL of alcohol (ethanol) per 100 mL of solution. Alcoholic beverages often have alcohol content cited as proof.