"SI second defined by caesium-133 hyperfine transition"
The SI second equals exactly 9192631770 periods of the Cs-133 hyperfine transition radiation.
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⚑ held by convention · challengeableThis claim has no dependencies — the drill terminates here. Not because bedrock was reached, but because this is where the community currently agrees to stop digging. It is epistemically identical to every other node: held by convention, and challengeable.
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Answer
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The second is defined in the International System of Units (SI) as the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. Adopted by the 13th CGPM in 1967.
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