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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.
BAC Definition and State Legal Laws. Blood alcohol content (BAC), also called Blood Alcohol Concentration, is most commonly used as a metric of alcohol intoxication for legal or medical purposes. Blood alcohol content is usually expressed as a percentage of alcohol (generally in the sense of ethanol) in the blood.