The second is explained as the span of exactly 9,192,631,770 periods of the radiation corresponding to the change between two hyperfine levels of caesium-133 atom.
Clocks usually measure world time.
The second is explained as the span of exactly 9,192,631,770 periods of the radiation corresponding to the change between two hyperfine levels of caesium-133 atom.
Clocks usually measure world time.
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