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The Precious Metals, Comprising Gold, Silver and Platinum. New York: D. Van Nostrand Company, 1909: 255. — "Pure platinum, according to G. Matthey has a density of 21.46." 79 Au gold; use: 19.3 g/cm 3: WEL (near r.t.) 19300 kg/m 3: LNG (at r.t.) 19.3 g/cm 3: CRC (near r.t.) 19.3 g/cm 3: 81 Tl thallium; use: 11.85 g/cm 3: WEL (near r.t.) 11850 ...
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Gold: English, from same Proto-Indo-European root as 'yellow' · Symbol Au, from Latin aurum: 11 6 d-block 196.97: 19.3: 1 337.33: 3129: 0.129: 2.54: 0.004: primordial solid 80 Hg Mercury: Mercury, Roman god of commerce, communication, and luck, known for his speed and mobility · Symbol Hg, from Latin hydrargyrum, from Greek hydrárgyros ...
The composition of the Earth changed after its formation due to loss of volatile compounds, melting and recrystalization, selective loss of some elements to the deep interior, and erosion by water. [ 3 ] : 55 The lanthanides are especially difficult to measure accurately.
The grain was the legal foundation of traditional English weight systems, [5] and is the only unit that is equal throughout the troy, avoirdupois, and apothecaries' systems of mass. [6]: C-6 The unit was based on the weight of a single grain of barley which was equal to about + 4 ⁄ 3 the weight of a single grain of wheat.
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The only troy weight in widespread use is the British Imperial troy ounce and its American counterpart. Both are based on a grain of 0.06479891 gram (exact, by definition), with 480 grains to a troy ounce (compared with 437 + 1 ⁄ 2 grains for an ounce avoirdupois). The British Empire abolished the 12-ounce troy pound in the 19th century.
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