The "reference kilogram" kept in Paris for standardization of weights and measures is
gradually losing mass when compared with other copies:
"The mystery is that they were all made of the same material, and many were made at the same time and kept under the same conditions, and yet the masses among them are slowly drifting apart," he said. "We don't really have a good hypothesis for it."
I can't imagine a chemical explanation -- perhaps we're not meant to have a perfect representation of mass . . .
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