What does proof mean on alcohol?

"Proof" on alcohol refers to the percentage of alcohol by volume (ABV) in a beverage. It's a historical term that originated from a method used to test the strength of spirits.

Here's how it works:

* Historically: Proof was determined by mixing a sample of alcohol with gunpowder. If the mixture ignited, it was considered "proof" that the alcohol was strong enough. The higher the percentage of alcohol, the more likely the gunpowder would ignite.

* Today: Proof is a standardized measurement, with 100 proof equaling 50% ABV. So, a bottle of 80 proof whiskey contains 40% alcohol.

Here are some things to remember:

* Proof is always double the ABV.

* Different countries may have different definitions of proof.

* "Proof" is not a measure of quality. It only indicates the alcohol concentration.

So, the next time you see a bottle of liquor labeled "80 proof," you'll know that it contains 40% alcohol.