21. The grain was the legal foundation of troy, avoirdupois , and apothecaries'systems of mass. 22. The terms fluid ounce, pint, quart, gallon, pounds are Avoirdupois unless otherwise indicated. 23. In the Imperial Weights and Measures Act of 1824, the avoirdupois pound was defined as grains exactly. 24. Before our combined avoirdupois could be accommodated, the service manager had to suction out 100 gallons of water. 25. More bad news for the avoirdupois -challenged : A scale that insults you if you're overweight. 26. Prior to 1588, the " part " ( ) was the smallest unit in the avoirdupois weight system. 27. When the Tower system was abolished in the 16th century, the bushel was redefined as 56 avoirdupois pounds. 28. This convenient fluid-ounce-to-avoirdupois -ounce relation does not exist in the US system. 29. The obsolete troy pound was divided into 12 ounces, rather than the 16 ounces per pound of the Avoirdupois system. 30. The definition of the pound avoirdupois in the imperial system is identical to that in the U . S . customary system.
