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IEVref:112-02-04ID:
Language:enStatus: Standard
Term: second
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Symbol: s
Definition: SI unit of time, equal to 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

NOTE – The CIPM affirmed that this definition refers to a caesium atom in its ground state at a temperature of 0 K.


Publication date:2010-01
Source:CGPM
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