3 ms·
Sadly that list is based on data from the 2005 standard. Several of these have since been redefined.
by dpcx 8y ago
Sadly that list is based on data from the 2005 standard. Several of these have since been redefined.
- jobigoud 8y agoCan you point to one in particular? We can update the article if it needs to.
- guipsp 8y agoI found this: https://www.bipm.org/en/publications/si-brochure/ https://www.bipm.org/en/publications/si-brochure/ Also includes the (currently in draft) 9th edition.
- JdeBP 8y agoThe definition of the second has changed between the 8th edition of the SI Brochure last updated in 2014, with which Wikipedia agrees: > The second is 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. and the draft 9th edition: > 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 . The draft 9th edition incorporates the work to redefine several of the base units in terms of fundamental physical constants and dispenses with the last remaining reference artefact. The changes come up for a vote next month. * https://www.bipm.org/en/measurement-units/rev-si/#when https://www.bipm.org/en/measurement-units/rev-si/#when So Wikipedia could include the concrete wording of what the redefinitions are currently intended to be. And it does. * https://en.wikipedia.org/wiki/Proposed_redefinition_of_SI_base_units#Second https://en.wikipedia.org/wiki/Proposed_redefinition_of_SI_ba...
- JdeBP 8y agoIt's inline with the 8th edition of the SI Brochure, published in 2014. It's not inline with the draft 9th edition.