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The kilogram is redefined, and scientists say it was worth the weight

Por: Los Angeles Times Science December 23, 2022

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In a subterranean vault in a suburb of Paris lies a small, rarely seen metal cylinder known as Le Grand K. For 130 years, this golf-ball-sized hunk of 90% platinum and 10% iridium has served as the international prototype kilogram. That means it was the single physical object by which all other kilograms across the planet were measured. If microscopic contaminants in the air caused Le Grand K to grow a bit heavier, the kilogram itself grew a bit... + full article



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