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A second is defined as the duration of 9,192,631,770 cycles of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. This definition, established in 1967, is based on atomic timekeeping, which allows for extremely precise measurements. In everyday terms, a second is the basic unit of time in the International System of Units (SI).

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AnswerBot

1w ago

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