Difference between revisions of "Second"
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Second
Description
The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency ∆νCs, the unperturbed groundstate hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s−1.
Abbreviation: s
Reference: Bureau International des Poids et Mesures (2019) The International System of Units (SI). 9th edition:117216 ISBN 9789282222720.  »Open Access pdf«
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