Kilogram: Verskil tussen weergawes

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Slashme (besprekings | bydraes)
k Verwyder irrelevante Engelse teks
Martinvl (besprekings | bydraes)
Nota by te voeg
Lyn 18:
|location = Heidelberg
|language = Engels
|year = 2014}}</ref> Aangesien dit onprakties is vir akkurate metings, is 'n platinumsilinder in 1889 gemaak, en sedertdien as die definisie van die kilogram gebruik. Die massa van hierdie prototipe het egter oor tyd gewissel in vergelyking met replikas wat daarvan gemaak is, wat daartoe gelei het dat die CGPM in 2011 beslis het dat die kilogram toekomstig in terme van die [[Konstante van Planck]] gedefinieer moet word. Omdat die tegnologiese middele nog nie gereed was nie, is die finale besluit eers tot 2014 uitgestel, en toe weer tot 2018. Op 16 November 2018<ref name="Milton16">{{cite conference|conference=SIM XXII General Assembly|location=Montevideo, Uruguay|url=http://www.sim-metrologia.org.br/docs/2016Presentations/BIPM%202016.pdf#page=10|conference-url=http://www.sim-metrologia.org.br/docs/2016Presentations/|page=10|title=Highlights in the work of the BIPM in 2016|first=Martin|last=Milton|date=14 November 2016}}</ref> is die verandering goedgekeur,<ref name="Minutes2014">{{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]]|first=B.|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> en die nuwe definisies sal op 20 Mei 2019 in werking tree.<ref>[http://www.bipm.org/en/committees/cipm/meeting/105.html Decision CIPM/105-13 (October 2016)].</ref><ref group = nota>Die meterkonvensie is op 20 Mei 1875 in Parys deur 18 lande ondergeteken</ref> Die nuwe definisie van die SI basiseenhede spruit uit 'n herdefinisie van Planck se konstante as presies {{val|6.62607015|e=-34|u=kg⋅m<sup>2</sup>⋅s<sup>−1</sup>}}, sodat die kilogram in terme van die sekonde en die meter gedefinieer word.<ref name="draft-resolution-A">{{citation|title=Draft Resolution A "On the revision of the International System of units (SI)" to be submitted to the CGPM at its 26th meeting (2018)|url=https://www.bipm.org/utils/en/pdf/CGPM/Draft-Resolution-A-EN.pdf}}</ref>
 
Dit is die enigste SI basiseenheid met 'n [[SI-voorvoegsel]] deel van die naam. Dit is ook die enigste SI-eenheid wat steeds gedefinieer word as 'n [[kunsproduk]] eerder as 'n fundamentele fisiese eienskap wat geproduseer kan word in verskillende laboratoriums.
 
==Notas==
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== Bronne ==