When shopping for spirits, you might see two different values on labels: "ABV," or alcohol by volume, and "proof." That second one isn't always there, as distilleries in the United States aren't ...
If you've ever wondered what the strongest alcoholic drink you can have is, the answer lies in something called the "proof" ...
Proof is a measure of the alcohol content of a beverage. In the U.S., policymakers define proof as twice the percentage of alcohol by volume (ABV). For example, a drink with 40% ABV is 80 proof.