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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.
Definition: Blood-alcohol content refers to the amount of alcohol contained in a person's blood. It is expressed in terms of weight per unit of volume. Blood alcohol content is the amount of alcohol present in a 100 milliliter (mL) volume of blood. For example 80 mg is 0.08 grams, 0.08 grams of alcohol in 100 mLs is written as 0.08%. In other words, 80 mg% is equal to 0.08% which is equal to 80 mg/dL (deciliter; 100 mLs).