What does proof equal in alcoholic beverages?

Here's how it works:

* ABV: This is the percentage of pure alcohol present in a beverage. For example, a beer with 5% ABV contains 5% pure alcohol by volume.

* Proof: This is a measure of the alcohol content, calculated as twice the ABV. So, a beer with 5% ABV would be 10 proof (5 x 2 = 10).

Therefore, to find the proof of an alcoholic beverage, simply multiply the ABV by 2.

Examples:

* 80 Proof Whiskey: Has an ABV of 40% (80 / 2 = 40)

* 100 Proof Vodka: Has an ABV of 50% (100 / 2 = 50)

* 40 Proof Wine: Has an ABV of 20% (40 / 2 = 20)

Keep in mind that proof is a historical term, originating from a method of testing alcohol content by setting the beverage on fire. If it burned, it was "proof" that it contained alcohol.