00000nam 2200000zi 4500 9.930458 CaOODSP 20240214095517 m o d f cr cn||||||||| 231117t20232023oncao o f00| 0 eng d 9780660688718 CaOODSP eng rda CaOODSP n-cn--- NR16-429/2023E-PDF The international system of units : a shift to fundamental constants. [Ottawa] : National Research Council Canada = Conseil national de recherches Canada, [2023]. ©2023 1 online resource (8 unnumbered pages) : illustrations, photographs text txt rdacontent computer c rdamedia online resource cr rdacarrier Cover title. Issued also in French under title: Le système international d'unités : vers des constantes fondamentales. "The International System of Units (SI) is the most widely used system of units with official status in almost every country in the world. It contains seven base units, which are all dependent simply, repeatably and accurately on physical constants, which are always the same and can be measured anywhere. The Planck constant is a fundamental constant of nature that scales the relationship between the energy and frequency of light. The National Research Council of Canada (NRC) is one of a few national metrology institutes providing leadership in experiments that are essential to determining the unit kilogram from Planck constant"--Innovation in Canada’s measurement standards, page [3]. Metric system Canada. National Research Council Canada, issuing body. Le système international d'unités : (CaOODSP)9.930460 The international system of units : (CaOODSP)9.930459 PDF 1.23 MB https://publications.gc.ca/collections/collection_2024/cnrc-nrc/NR16-429-2023-eng.pdf