SI units

plural noun

1. International System of Units

Example Sentences

In that case, metrologists were adapting to fit the needs of chemists, who wanted a way to express SI units on the scale of Avogadro’s number—the 6 × 1023 units in a mole, a measure of the quantity of substances.

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In May, it was announced that the international SI units of measurement had been redefined.

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New definitions of SI units come into force Revised definitions of four scientific units — the kilogram, the kelvin, the ampere and the mole — came into force on 20 May, World Metrology Day.

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The shift marks the biggest shake-up of SI units since 1875, and will be most transformational for the kilogram.

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The three other basic SI units — the second, the metre and the candela — are already based on constants.

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