Originally Posted by
lynx
They are the same.
The alternative would be to measure alcohol by weight (ABW), but since alcohol is much dense than water (the other basic ingredient of alcoholic drinks) working out the amount of alcohol is more complex.
With ABV, at 20% you know there are 200ml of alcohol per litre, at 40% you know there are 400ml of alcohol per litre, etc.
With ABW, at 20% there are at 241 ml of alcohol, at 40% there are 459 ml of alcohol. It isn't linear so you can't easily work out how much you are getting.
I need a drink after working that out.
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