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On holiday recently I bought a bottle of Italian wine. The label contained the item "Alcole effetivo 7,5%vol - Alcole totale 10,5%vol"
To convert ABW to ABV we take our ABW and divide by the density of ethyl alcohol (0.79)
True, but it's not as close as I'd expect; 9.5% isn't 10.5% Either the tax man or the consumer would be ripped off) and anyway, both values are said to be % by volume.