Sistem Satuan Internasional: Perbedaan antara revisi

Pada tahun 2015, [[CODATA|Kelompok Tugas CODATA tentang Konstanta Dasar]] mengumumkan tenggat waktu untuk pengajuan khusus data untuk menghitung nilai akhir dari definisi baru.<ref>{{cite journal |author-last1=Mohr |author-first1=Peter J. |author-last2=Newell |author-first2=David B. |author-last3=Taylor |author-first3=Barry N. |date=2015 |title=CODATA recommended values of the fundamental physical constants: 2014 – Summary |url=http://codata.org/blog/2015/08/04/codata-recommended-values-of-the-fundamental-physical-constants-2014/ |journal=Zenodo |doi=10.5281/zenodo.22827 |quote=Because of the good progress made in both experiment and theory since the 31 December 2010 closing date of the 2010 CODATA adjustment, the uncertainties of the 2014 recommended values of {{mvar|h}}, {{mvar|e}}, {{mvar|k}}, and {{math|''N''_A}} are already at the level required for the adoption of the revised SI by the 26th CGPM in the fall of 2018. The formal road map to redefinition includes a special CODATA adjustment of the fundamental constants with a closing date for new data of 1 July 2017 in order to determine the exact numerical values of {{mvar|h}}, {{mvar|e}}, {{mvar|k}}, and {{math|''N''_A}} that will be used to define the New SI. A second CODATA adjustment with a closing date of 1 July 2018 will be carried out so that a complete set of recommended values consistent with the New SI will be available when it is formally adopted by the 26th CGPM. }}</ref>

Definisi baru diadopsi pada CGPM ke-26 pada tanggal 16 November 2018, dan mulai berlaku pada tanggal 20 Mei 2019.<ref>{{Cite web |url=http://www.bipm.org/cc/TGFC/Allowed/Minutes/CODATA_Minutes_14-BIPM-public.pdf |title=Report on the Meeting of the CODATA Task Group on Fundamental Constants |date=3–4 November 2014 |place=[[BIPM]] |author-first=B. |author-last=Wood |page=7 |quote=[BIPM director Martin] Milton responded to a question about what would happen if ... the CIPM or the CGPM voted not to move forward with the redefinition of the SI. He responded that he felt that by that time the decision to move forward should be seen as a foregone conclusion.}}</ref>