International System of Units | Measurement, Conversion & History
https://www.britannica.com/science/International-System-of-Units
WebIts seven basic units, from which other units are derived, were defined as follows: for length, the metre, defined as the distance traveled by light in a vacuum in 1/299,792,458 second; for mass, the kilogram, which equaled 1,000 grams as defined by the international prototype kilogram of platinum-iridium in the keeping of the International Bure...
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