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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.
9.2k Views. In the US, we use a measure for alcohol called Alcohol proof. 200 proof is pure alcohol and 100 proof is 50%. The reason this measurement system exists is because 100 proof is the minimum level where the liquid is flammable. So, 50% is the minimum. ==Edit==.