Assertion: kilogram's mass | /r/HasProperty | measured a platinum alloy cylinder
Facets:
value: typically
type: DEGREE
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.