As a unit of measure, the ounce referred to 'a unit of weight equal to (a) one-twelfth of a pound in troy and apothecaries' measure, equal to 480 grains (= 31.1 grams); (b) one-sixteenth of a pound in
avoirdupois measure (= ~ 28.3 grams)' (OED).
Our grain derives from the French
avoirdupois system that evolved as a means to help regulate the products sold in trade.
Unit Equivalent in Metric Units Mass 1 short ton = 0.907 184 7 metric tons (t) (2,000 lb) 1 long ton = 1.016 047 metric tons (t) 1 pound (lb) = 0.453 592 37 (a) kilograms (kg) 1 pound uranium = 0.384 647 (b) kilograms oxide (lb uranium (kgU) [U.sub.3] [O.sub.8]) 1 ounce, = 28.349 52 grams (g)
avoirdupois (avdp oz) Volume 1 barrel of oil = 0.158 987 3 cubic meters (bbl) ([m.sup.3]) 1 cubic yard = 0.764 555 cubic meters ([yd.sup.3]) ([m.sup.3]) 1 cubic foot = 0.028 316 85 cubic meters ([ft.sup.3]) ([m.sup.3]) 1 U.S.
Unit Equivalent in Metric Units Mass 1 short ton (2,000 lb) = 0.907 184 7 1 long ton = 1.016 047 1 pound (lb) = 0.453 592 37 (a) 1 pound uranium oxide = 0.384 647 (b) (lb [U.sub.3][O.sub.8]) 1 ounce,
avoirdupois = 28.349 52 (avdp oz) Volume 1 barrel of oil (bbl) = 0.158 987 3 1 cubic yard ([yd.sup.3]) = 0.764 555 1 cubic foot ([ft.sup.3]) = 0.028 316 85 1 U.S.
Unit Equivalent in Metric Unit Units Mass 1 short ton = 0.907 184 7 (2,000 lb) 1 long ton = 1.016 047 1 pound (lb) = 0.453 592 37 (a) 1 pound uranium = 0.384 647 (b) oxide (lb [U.sub.3][O.sub.8]) 1 ounce,
avoirdupois = 28.349 52 (avdp oz) Volume 1 barrel of oil (bbl) = 0.158 987 3 1 cubic yard = 0.764 555 ([yd.sup.3]) 1 cubic foot = 0.028 316 85 ([ft.sup.3]) 1 U.S.
Unit Units Mass 1 short ton (2,000 lb) = 0.907 184 7 1 long ton = 1.016 047 1 pound (lb) = 0.453 592 37 (a) 1 pound uranium oxide = 0.384 647 (b) (lb [U.sub.3] [O.sub.8]) 1 ounce,
avoirdupois = 28.349 52 (avdp oz) Volume 1 barrel of oil (bbl) = 0.158 987 3 1 cubic yard = 0.764 555 ([yd.sup.3]) 1 cubic foot = 0.028 316 85 ([ft.sup.3]) 1 U.S.
Unit Equivalent in Metric Units Unit Mass 1 short ton = 0.907 184 metric tons (t) (2,000 lb) 1 long ton = 1.016 047 metric tons (t) 1 pound (lb) = 0.453 592 37 (a) kilograms (kg) 1 pound uranium = 0.384 647 (b) kilograms oxide (lb uranium (kgU) [U.sub.3] [O.sub.8]) 1 ounce, 28.349 52 grams (g)
avoirdupois (avdp oz) Volume 1 barrel of oil = 0.158 987 3 cubic meters (bbl) ([m.sup.3]) 1 cubic yard = 0.764 555 cubic meters ([yd.sup.3]) ([m.sup.3]) 1 cubic foot = 0.028 316 85 cubic meters ([ft.sup.3]) ([m.sup.3]) 1 U.S.
Unit Equivalent in Metric Units Unit Mass 1 short ton = 0.907 184 metric tons (t) (2,000 lb) 1 long ton = 1.016 047 metric tons (t) 1 pound (lb) = 0.453 592 kilograms (kg) 1 pound uranium = 0.384 647 kilograms oxide (lb uranium (kgU) [U.sub.3] [O.sub.8]) 1 ounce, 28.349 52 grams (g)
avoirdupois (avdp oz) Volume 1 barrel of oil = 0.158 987 cubic meters (bbl) ([m.sup.3]) 1 cubic yard = 0.764 555 cubic meters ([yd.sup.3]) ([m.sup.3]) 1 cubic foot = 0.028 316 cubic meters ([ft.sup.3]) ([m.sup.3]) 1 U.S.
Unit Equivalent in Metric Units Mass 1 short ton 0.907 184 7 metric tons (t) (2,000 lb) 1 long ton 1.016 047 metric tons (t) 1 pound (lb) 0.453 592 37 (a) kilograms (kg) 1 pound uranium 0.384 647 (b) kilograms oxide uranium (kgU) (lb [U.sub.3] [O.sub.8]) 1 ounce, = 28.349 52 grams (g)
avoirdupois (avdp oz) Volume 1 barrel of oil = 0.158 987 3 cubic meters (bbl) ([m.sup.3]) 1 cubic yard = 0.764 555 cubic meters ([yd.sup.3]) ([m.sup.3]) 1 cubic foot = 0.028 316 85 cubic meters ([ft.sup.3]) ([m.sup.3]) 1 U.S.
Unit Equivalent in Metric Units Mass 1 short ton (2,000 lb) = 0.907 184 7 1 long ton = 1.016 047 1 pound (lb) = 0.453 592 37 (a) 1 pound uranium oxide (lb [U.sub.3][O.sub.8]) = 0.384 647 (b) 1 ounce,
avoirdupois (avdp oz) = 28.349 52 Volume 1 barrel of oil (bbl) = 0.158 987 3 1 cubic yard ([yd.sup.3]) = 0.764 555 1 cubic foot ([ft.sup.3]) = 0.028 316 85 1 U.S.