The future of mass depends on a conference vote next week.
A long-discussed resolution for next week’s General Conference on Weights and Measures would toss out the international prototype of the kilogram—a hunk of platinum and iridium in Paris that everyone agrees weighs 1 kilogram. Instead, the International Bureau of Weights and Measures (BIPM) would redefine the International System of Units to ensure that kilograms are based on things that can’t change over time. It would require an entire rethinking of how kilograms work.
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