Assertion: kilogram | /r/HasProperty | the mass of a body
Facets:
value: at rest
type: TEMPORAL
Source sentences:
text: For illustration, an earlier proposed redefinition that is equivalent to this 2019 definition is: "The kilogram is the mass of a body at rest whose equivalent energy equals the energy of a collection of photons whose frequencies sum to [1.356392489652×1050] hertz.