What is the alcohol percentage of 70 proofs whiskey?
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Thus pure 100% alcohol will have 100×(7⁄4) = 175° proof, and a spirit containing 40% ABV will have 40×(7⁄4) = 70° proof. The proof system in the United States was established around 1848 and was based on percent alcohol rather than specific gravity. 50% alcohol by volume was defined as 100 proof.
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