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Description
The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency โฮฝCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to sโ1.
Abbreviation: s
Reference: Bureau International des Poids et Mesures (2019) The International System of Units (SI). 9th edition:117-216 ISBN 978-92-822-2272-0. - ยปOpen Access pdfยซ
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