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.

The legislation’s promoters say Virginia already allows sale of high-proof liquor brands in state stores and that the state’s current prohibition on sales of clear, grain spirits above 101 proof — or ...

The liquor industry is obsessed with the strength of a whiskey when it’s bottled: 80 proof, 100 proof, cask strength. But there’s another measure of alcohol potency that’s just as important—if not ...