Assertion: kilogram | /r/HasProperty | defined for more than a century
Facets:
Source sentences:
text: For more than a century, the kilogram — the fundamental mass unit in the International System of Units (SI) — was defined as exactly equal to the mass of a small polished cylinder, cast in 1879 of platinum and iridium, which was kept in a triple-locked vault on the outskirts of Paris.
text: For more than a century, the kilogram — the fundamental mass unit in the International System of Units (SI) — has been defined as exactly equal to the mass of a human-made small polished cylinder.