`, 1 Oct 2004 (UTC)  Still digging. For liquid:liquid solutions such as alcohol: ``Volume-volume percentage or % (v/v) describes the ml solute per 100 mL solution. This is most useful when liquids are being mixed. For example, beer is about 5% ethanol by volume. This means every 100 mL beer contains 5 mL ethanol (ethyl alcohol).`` (chem lecture notes) Need to re-write and include as volume-volume concentration. Still more to do ) - 02:19`