United States customary units ounces. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, but in the US it is defined as of a US gallon. Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois. The saying "a pint's a pound the world around" refers to 16 US fluid ounces of water weighing approximately (about 4% more than) one pound avoirdupois. An imperial pint of water weighs a pound and a quarter (20 oz). There are varying standards for barrel for some specific commodities, including 31 gal for beer, 40 gal for whiskey or
Anglo-Saxon pound troy pound of 367.5 g. This pound of 12 ounces was in use in Troyes (Champagne fairs) where the mark of 8 ounces (also the Paris mark) weighed 245 g. The medieval troy pound weighed 240 pennyweights of 1.53 g or 24 medieval troy grains ( of the new pound and heavier than the real barleycorn). The Tower pound remained in use for weighing gold and silver until 1527. Anglo-Saxon pound The pound was a unit of account in Anglo-Saxon England, equal to 240 silver pennies and equivalent to one pound weight of silver. According to the Daily Telegraph it