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kilogram |
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kilogram, abbr. kg, fundamental unit of mass in the metric system metric system, system of weights and measures planned in France and adopted there in 1799; it has since been adopted by most of the technologically developed countries of the world. ..... Click the link for more information. , defined as the mass of the International Prototype Kilogram, a platinum-iridium cylinder kept at Sèvres, France, near Paris. Copies of this standard are deposited at bureaus of standards throughout the world, and other units of mass are defined in terms of it. When the metric system was originally devised, the kilogram was defined so that 1,000 cubic centimeters (1 cubic decimeter) of pure water has a mass of exactly 1 kilogram. See metric system. |
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| Some of the mice received 250 nanograms of bisphenol-A daily per kilogram of body weight (ng/kg/day); others received 25 ng/kg/day. Brain Hg content was also expressed as nanograms of rig per whole brain to adjust for organ growth. 000000714--less than one part per million, or 714 nanograms per gram, an order of magnitude less that the figure expressed in numbers. |
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nanogram
