<P> 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 . </P> <P> The measurement of alcohol content and the statement of content on bottles of alcoholic beverages is regulated by law in many countries . </P>

What percentage of alcohol does a bottle of 80-proof vodka contain