Assertion: kilogram | /r/HasProperty | ipk
Facets:
Source sentences:
text: Typically, the mass of objects is measured in relation to that of the kilogram, which is defined as the mass of the international prototype of the kilogram (IPK), a platinum alloy cylinder stored in an environmentally-monitored safe secured in a vault at the International Bureau of Weights and Measures in France.
text: Since their manufacture, drifts of up to 2×10−8 kilograms per year in the national prototype kilograms relative to the international prototype of the kilogram (IPK) have been detected.