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Avoirdupois (/ ˌ æ v ər d ə ˈ p ɔɪ z, ˌ æ v w ɑːr dj uː ˈ p w ɑː /; [1] abbreviated avdp.) [2] is a measurement system of weights that uses pounds and ounces as units. [ 3 ] [ 4 ] It was first commonly used in the 13th century AD and was updated in 1959.
One avoirdupois ounce of water has an approximate volume of one imperial fluid ounce at 62 °F (16.7 °C) [f]: this convenient fluid ounce to avoirdupois ounce relation does not exist in the US system, as one US fluid ounce is 4.318% larger than the avoirdupois ounce.
The apothecaries and troy pounds are divided into 12 ounces (of 480 grains) while the avoirdupois pound has 16 ounces (of 437.5 grains). The unit of volume, the gallon , has different values in the United States and in the United Kingdom – the US fluid gallon being about 0.83 imperial gallons and the US dry gallon being about 0.97 imperial ...
An ounce-force is 1 ⁄ 16 of a pound-force, or about 0.2780139 newtons. It is defined as the force exerted by a mass of one avoirdupois ounce under standard gravity (at the surface of the earth, its weight). The "ounce" in "ounce-force" is equivalent to an avoirdupois ounce; ounce-force is a measurement of force using avoirdupois ounces.
The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement.Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.453 592 37 kilograms, and which is divided into 16 avoirdupois ounces. [1]
An acre was 4 rods × 40 rods, i.e. 160 square rods or 36,000 square Anglo-Saxon feet. ... from 256 oz to 1 ... The avoirdupois pound was eventually standardised as ...
In both British Imperial units and United States customary units, there are precisely 7,000 grains per avoirdupois pound, and 5,760 grains per troy pound or apothecaries' pound. [6]: C-6–C-7 It is obsolete in the United Kingdom and, like most other non-SI units, it has no basis in law and cannot be used in commerce. [10]
Avoirdupois: long ton: LT (none) 2,240 lb ... per acre /acre /acre /ha; ... dollars per troy ounce $/ozt 12 troy ounces in 1 troy pound