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the claim
The mole was redefined in 2019 using an exact numerical value for the Avogadro constant
the verdict
SUPPORTED
the evidence backs this
confidence 75/100

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

Evidence for · 3
Wikipedia: Avogadro constant
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Reference article covering this claim directly
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More for · 2
Wikipedia: 2019 revision of the SI
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Reference article covering this claim directly
en.wikipedia.org: 2019 revision of the SI
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Explicitly states that in 2019 the mole was defined by setting an exact numerical value for the Avogadro constant.
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first checked31 Jul 2026
judged → SUPPORTED · 7531 Jul 2026
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