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The question as I heard it years ago was phrased, "Which is heavier a pound of gold or a pound of feathers?" Gold, being a precious metal, is weighed on the Troy system, which uses a wimpy pound and a wimpy ounce. Feathers are measured on the avoirdupois system, which has 16 full ounces in a pound. Ah, but you asked about the kg! As far as I know, a kg is a kg. So ten thousand grams of copper are heavier than one thousand grams of gold. (Technically, a kg is mass rather than weight, but that is another problem.)

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10y ago

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