has a dimension of M where M is mass. = 16 ounces (oz.) Most commodities use the avoirdupois system of mass units. Download a printable chart for converting visually between pounds avoirdupois and kilograms.. Roughly translated means "goods of weight" or "goods [sold] by weight" to distinguish it from goods sold by the piece. Here is information about the units of measure used in the United States. The avoirdupois system is a system that was commonly used in the 13 th century. It is a system that was based on a physical standardized pound that used a prototype weight. This unit is commonly used in the UK, US unit systems. It is because a troy pound is a specific unit, defined as 12 troy ounces. avoirdupois unit. Wait â howâs that possible? It was updated to its current form in 1959. It can be converted to the corresponding standard SI unit kg by multiplying its value by a factor of 0.02834952313. The term was adapted from the French phrase "aveir de pois" or "aver de peis". So if you measure pounds in grams: 1 troy pound = 373.242 grams; 1 avoirdupois pound = 453.592 grams; It can be a hefty concept to grasp, I know! The basis of the avoirdupois system â¦ But under the metric system, a pound is 16 ounces. There were other measurement units in use at the time, but the avoirdupois system used 3 even numbers as divisors, which probably increased its popularity. There is only one conversion factor that youâll need to know for the Avoirdupois System: 1 pound (lb.) The pound is the base unit of the United States customary system for measuring weight and mass.The pound avoirdupois is used in most applications; a different pound (the troy pound) was used for precious metals, and another, equal to the troy pound (the apothecaries pound) but both are obsolete today.. This prototype weight could be divided into 16 ounces, a number that had three even divisors (8, 4, 2). The National Institute of Standards and Technology (NIST) - The NIST Guide for the use of the International System of Units - Appendix B, subsections B.8 Factors for Units Listed Alphabetically and B.9 Factors for units listed by kind of quantity or field of science. Pound, unit of avoirdupois weight, equal to 16 ounces, 7,000 grains, or 0.45359237 kg, and of troy and apothecariesâ weight, equal to 12 ounces, 5,760 grains, or 0.3732417216 kg.The Roman ancestor of the modern pound, the libra, is the source of the abbreviation lb.In medieval England several derivations of the libra vied for general acceptance. . ), oz (av.)) Avoirdupois measurements are used for coarse dry weights such as grain, flour, sugar, tea, etc., and are the units of weight you likely learned about in school. Ounce (avoirdupois) (oz (advp. For more, see the Infoplease. This page includes linear measurements, finding area, cubic, liquid, apothecaries' fluid and weight, Avoirdupois weight, dry measure, troy weight, and Gunter's or Surveyor's chain. References/ Further Reading. It is also known as ounces. The Avoirdupois System originates from France and is commonly used today in the United States to describe units of weight. pound avoirdupois. It was first commonly used in the 13th century AD and was updated in 1959. is a measurement system of weights which uses pounds and ounces as units. The avoirdupois system (/ Ë æ v Ér d É Ë p ÉÉª z, Ë æ v w ÉËr dj uË Ë p w ÉË /; abbreviated avdp.) 7 When the terms âhundredweightâ and âtonâ are used unmodified, they are commonly understood to mean the 100pound - hundredweight and the 2000-pound ton, respectively; these units may be designated ânetâ or âshortâ when necessary to distinguish them from the corresponding units in gross or long measure. 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