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Redefinition of SI based units
The International system of Units (SI) includes seven base units: the metre, the kilogram, the second, the ampere, the kelvin, the mole, and the candela, forming a foundation around which cooperation and collaboration on a global scale can take place. The SI units have been under constant improvement since the 17th Century when a committee of the French Academy of Sciences introduced the first unified measurement system based on the artefacts for the metre and the kilogram. Recent advances...