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9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom

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βˆ™ 15y ago
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βˆ™ 7mo ago

A second is a unit of time that is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. In more practical terms, a second is a relatively short duration that helps us measure time intervals in our everyday lives.

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