%v/v - is an abbreviation for percentage volume of a substance of the total volume - e.g. 12.5 % v/v ethanol. = 12.5 ml ethanol in approx. 87.5 ml water Alcohol concentration is stated as ethanol as it is the predominant alcohol in wine often seen on wine labels as 12.5 % Alc. or 12.5 ALC/VOL or ALCOHOL 12.5% BY VOLUME (note the predominant alcohol in wine is ethanol).