Difference between revisions of "Second"
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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 ∆''ν''Cs, 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 | |description=The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency ∆''ν''<sub>Cs</sub>, 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 s<sup>−1</sup>. | ||
|info=Bureau International des Poids et Mesures (2019) The International System of Units (SI). 9th edition:117-216 ISBN 978-92-822-2272-0. - [https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-EN.pdf »Open Access pdf«] | |info=Bureau International des Poids et Mesures (2019) The International System of Units (SI). 9th edition:117-216 ISBN 978-92-822-2272-0. - [https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-EN.pdf »Open Access pdf«] | ||
}} | }} | ||
{{Keywords SI base units}} | |||
{{MitoPedia concepts | {{MitoPedia concepts | ||
|mitopedia concept=Ergodynamics | |mitopedia concept=Ergodynamics | ||
}} | }} | ||
Revision as of 07:20, 15 August 2019
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 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 s−1.
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. - »Open Access pdf«
Template:Keywords SI base units
MitoPedia concepts:
Ergodynamics