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memes@lemmy.world · 6 days ago

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memes@lemmy.world · 6 days ago

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TonyTonyChopper@mander.xyz
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After the 2019 revision of the SI, this definition [of the metre] was rephrased to include the definition of a second in terms of the caesium frequency ΔνCs.

https://en.wikipedia.org/wiki/Metre

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