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In the U.S., proof equals twice the percentage of alcohol in the beverage.

In the UK, and several European countries, the 'proof' of alcohol is not given, it is stated as a percentage of volume.

However this is somewhat misleading.

Pure alcohol, which would be 100% alcohol, very difficult to produce, would be classed as 200 proof.

Confusing to the uninitiated. All spirit drinks sold retail in the UK must state their alcohol by volume and not their 'proof'.

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Q: What is the mathematical equation of proof?
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