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A hand holds a magnifying glass over an Absolut Vodka label, highlighting “80 PROOF” with question marks in the background.

A piña colada, a bottle of brown liquor, a full shot glass, a cocktail in a coupe glass, and a bottle of gin sit on a bar. A sign labeled Britannica Bar hangs above them.

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A hand holds a magnifying glass over an Absolut Vodka label, highlighting “80 PROOF” with question marks in the background.

Why is alcohol measured by proof?

The answer involves lighting liquid on fire.

Video: Encyclopædia Britannica, Inc.

A piña colada, a bottle of brown liquor, a full shot glass, a cocktail in a coupe glass, and a bottle of gin sit on a bar. A sign labeled Britannica Bar hangs above them.

What Makes These Alcoholic Spirits Different?

To find out, we hit the bar.

Video: Encyclopædia Britannica, Inc.

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