Assertion: metric system's base unit | /r/CapableOf | depend for their definition
Facets:
Source sentences:
text: After the metre was redefined in 1960, the International Prototype of the Kilogram (IPK) was the only physical artefact upon which base units (directly the kilogram and indirectly the ampere, mole and candela) depended for their definition, making these units subject to periodic comparisons of national standard kilograms with the IPK.