The mole was redefined in 2019 using an exact numerical value for the Avogadro constant

the verdict

SUPPORTED

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2 sources for · 0 against

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The mole was officially redefined in May 2019 by fixing the Avogadro constant to an exact numerical value.

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Evidence for · 2

Wikipedia: Avogadro constant

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Wikipedia: Avogadro constant. Wikipedia. https://en.wikipedia.org/wiki/Avogadro_constant

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More for · 1

Wikipedia: 2019 revision of the SI

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Wikipedia: 2019 revision of the SI. Wikipedia. https://en.wikipedia.org/wiki/2019_revision_of_the_SI

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en.wikipedia.org: 2019 revision of the SI

Recorded source metadata

en.wikipedia.org: 2019 revision of the SI. en.wikipedia.org. https://en.wikipedia.org/wiki/2019_revision_of_the_SI

Explicitly states that in 2019 the mole was defined by setting an exact numerical value for the Avogadro constant.

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The paper trail · every fact has a biography

first checked31 Jul 2026

judged → SUPPORTED · 7531 Jul 2026

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