The history of indicating alcohol-by-volume by a spirit's "proof" has led to a complicated relationship between the two. Break it down here.
Why Is Proof Double the Percentage of Alcohol?
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What is the difference between alcohol proof and percentage? - Quora
What is the difference between ABV in beer and alcohol proof in hard liquor? - Quora
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What is the difference between ABV in beer and alcohol proof in hard liquor? - Quora
What does the proof of alcohol mean?