"SI second defined by cesium hyperfine transition"
The SI second is defined by a fixed number of cesium transitions.
Warrant (how it is justified) and consensus state / credence (where the community stands) are independent axes. The four warrant kinds are unordered peers — not a certainty ladder.
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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 SI unit of time, the second, is defined by taking the fixed numerical value of the caesium frequency Delta nu_Cs to be 9192631770 Hz.
Discussion
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(empty)
Consensus
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