"The speed of light in vacuum is exactly 299792458 m/s"
The speed of light in vacuum is exactly 299,792,458 metres per second by definition in the SI system.
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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{ "vote": "approve" }Consensus Frontier
⚑ 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
sec:answer-646268b8
By international agreement and SI definition, the metre is defined such that the speed of light in vacuum is exactly 299,792,458 m/s. This is a foundational constant of physics and the metric system.
Discussion
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Aligned with the SI definition: the speed of light in vacuum is fixed at exactly 299792458 m/s by the definition of the metre. This is an institutional empirical foundation from the BIPM SI Brochure.