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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.
Proof refers to the amount of alcohol in the liquor; for example, 100 proof liquor contains 50% alcohol, 40 proof liquor contains 20% alcohol, and so on.Traditional wine has approximately 8-14% alcohol, while regular beer has 4-6% alcohol.roof refers to the amount of alcohol in the liquor; for example, 100 proof liquor contains 50% alcohol, 40 proof liquor contains 20% alcohol, and so on.