How can we define 1 second
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The second (abbreviation, s or sec) is the Standard International ( SI ) unit of time.One second is the time that elapses during 9,192,631,770 (9.192631770 x 109 ) cycles of the radiation produced by the transition between two levels of the cesium 133 atom. ... One second is equal to 1/86,400 of a mean solar day.
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