Assertion: kilogram | /r/HasProperty | mass
Facets:
Source sentences:
text: By 1960, the International System of Units (SI) was published, and countries around the world established metrology institutions to continually refine the official definitions of our seven base units of measure: the meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance) and candela (luminosity).
text: But of the seven base units of the International System of Units (SI), four are not currently based on the constants of physics: the ampere (current), kelvin (temperature), mole (amount of substance) and kilogram (mass).