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the claim
The SI second is defined by a specific hyperfine transition frequency of cesium-133
the verdict
SUPPORTED
the evidence backs this
confidence 83/100

The SI second is officially defined by the hyperfine transition frequency of the cesium-133 atom.

Evidence for · 2
Towards the optical second: verifying optical clocks at the SI limit.
2019 · cited by 16
This paper notes that the current definition of the second in the SI is based on the microwave hyperfine transition in cesium-133 (133Cs).
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More for · 1
A Historical Review of U.S. Contributions to the Atomic Redefinition of the SI Second in 1967.
2017 · cited by 1
This historical review discusses the atomic redefinition of the SI second.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 8301 Aug 2026
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