The role of time and frequency metrology inside the new definitions of SI quantities

There is an on-going discussion, initiated in 2011, which proposes several changes to the official definitions of the base units of the International System of Units (SI). This will also entail changes in the relationships between the primary quantities of SI and some universal constants. One result...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-01, Vol.575 (1), p.12029-4
Main Authors: Tarelho, L V G, Rodrigues, F A, Baratto, A C, Garcia, G A, Souza, R S L
Format: Article
Language:English
Subjects:
Brazil
Constants
International System of Units
Maintenance
Metric system
Metrology
Physics
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Summary:There is an on-going discussion, initiated in 2011, which proposes several changes to the official definitions of the base units of the International System of Units (SI). This will also entail changes in the relationships between the primary quantities of SI and some universal constants. One result of this process points in the direction of giving greater importance and centrality to unit of time (s), increasing the practical importance of the realization of the quantities frequency and time. So, it is strongly recommended that the metrological maintenance of these quantities, in Brazil, be done in the Campus of INMETRO.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/575/1/012029