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13 February, 13:03

Why is the definition for second based on the Cesium 133 atom?

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  1. 13 February, 13:20
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    It is qualitatively defined as the second division of the hour by sixty, the first division by sixty being the minute. The SI definition of second is "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom ".
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