Does 40 Alcohol Mean 80 Proof?
No, 40% alcohol by volume does not mean 80 proof. Proof is a measure of the amount of alcohol in a distilled beverage, calculated as twice the percentage of alcohol by volume. Therefore, 40% alcohol would be 80 proof, but not all liquors with a proof of 80 have exactly 40% alcohol. It depends on the specific alcohol content of the drink.