Answers

2016-07-05T21:24:09+08:00
A "proven" solution was defined as 100 degrees proof (100°). People have found out that this takes 57.15% ethanol. This value is still used as the British definition. A simpler ratio to remember is seven to four: 70°proof is 40% alcohol by volume. A hydrometer can be used to measure the precise proof of a spirit.
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