How is one second time defined in SI system
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Second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun.
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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 10^9) cycles of the radiation produced by the transition between two levels of the Cesium 133 atom.
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