Alcohol by volume

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Alcohol by volume (abbreviated as alc/vol or ABV) is a common measure of the amount of alcohol contained in a given alcoholic beverage. It is a dimensionless quantity, often expressed in percent, defined as the volume concentration of ethanol mixed in the liquid, i.e., the ratio of volume of ethanol to the volume of the solution, both at 20 °C (68 °F). The International Organization of Legal Metrology has tables of density of water–ethanol mixtures at different concentrations and temperatures. In some countries, e.g. France, alcohol by volume is often referred to as degrees Gay-Lussac (after the French chemist Joseph Louis Gay-Lussac), although there is a slight difference since the Gay-Lussac convention uses the International Standard Atmosphere value for temperature, 15 °C (59 °F).

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