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The mass of an 80% silver centennial quarter is 5.83 grams, whereas the mass of a 50% silver centennial quarter is 5.05 grams. ------------- I don't think that this is correct. The nickel quarter made in 1968-1999 is indeed 5.05g, but the 80% and 50% silver quarters are each listed as 5.83g. Since Silver and Copper (the other componant of Canadian silver coins) have different densities (10.49g/cm3 for Silver and 8.96g/cm3 for Copper), the 80% and 50% coins should have either different weights or different volumes. Doing the math, if an 80% coin had a weight of 5.83g, it should have a volume of 0.5725cm3; a 50% coin with a volume of 0.5725cm3 should then have a weight of 5.57g. Alternatively, if the 50% coin has the same 5.83g weight, it should have a volume of 0.5994cm3; this implies, assuming that the coins have the same diameter, that the 50% should be about 5% thicker, which I think would be tough to discern without a fairly accurate micrometer (and, of course, a knowledge of how thick the 80% coin is meant to be).

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