An alcoholic beverage that is 80 proof contains what percentage of alcohol?

An alcoholic beverage that is 80 proof contains 40% alcohol. The proof system is a measurement of alcohol content, where the proof value is typically twice the percentage of alcohol by volume. Therefore, to find the alcohol content for an 80 proof beverage, you divide by 2, resulting in 40%. This standardized measure helps individuals understand the strength of an alcoholic beverage, indicating how much pure alcohol is present compared to the total volume of liquid.