プルーフ（酒類）
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定義
アルコール度数を表す指標。米国方式ではプルーフはアルコール度数（ABV）のちょうど2倍に等しい。
解説
A spirit labeled 80 proof is 40% ABV—the standard for most vodkas, gins, and whiskeys. The UK historically defined 100 proof as the minimum concentration at which gunpowder soaked in spirit would still ignite (~57.15% ABV). The US simplified this in the 19th century to the 2x ABV definition. The EU and most countries now use ABV percentage exclusively.
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