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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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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.
Troy weight is a system of units of mass that originated in the Kingdom of England in the 15th century [1] and is primarily used in the precious metals industry. The troy weight units are the grain , the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces).
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An average 70 kg human body is about 0.01% heavy metals (~7 g, equivalent to the weight of two dried peas, with iron at 4 g, zinc at 2.5 g, and lead at 0.12 g comprising the three main constituents), 2% light metals (~1.4 kg, the weight of a bottle of wine) and nearly 98% nonmetals (mostly water).
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