Units
Kilogram
Also Known As Kilo
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The kilogram is the base unit of mass in the International System of Units. Until 2019 it was defined by a single physical platinum-iridium cylinder kept in France, the last SI base unit still tied to a manufactured object; it is now defined by fixing the value of the Planck constant, connecting mass to precise measurements of electrical power through a device called a Kibble balance, so the definition no longer depends on any one artifact that could be damaged, contaminated, or lost.
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