What Exactly Are the New Definitions of Kilogram and Other SI Units?

Autor/inn/en	Lopac, Vjera; Hrupec, Dario
Titel	What Exactly Are the New Definitions of Kilogram and Other SI Units?
Quelle	In: Physics Teacher, 58 (2020) 1, S.58-61 (4 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0031-921X
Schlagwörter	Physics; Measurement; Scientific Concepts; Conferences (Gatherings); Decision Making; Definitions; Equations (Mathematics); Metric System; Numbers + Suchen Sie Ihr Suchwort? Physik; Messverfahren; Decision-making; Entscheidungsfindung; Begriffsbestimmung; Equations; Mathematics; Gleichungslehre; Metrischer Raum; Zahlenraum
Abstract	On November 16, 2018, at the 26th meeting of the General Conference on Weights and Measures (CGPM), a resolution was adopted that introduced historical changes into the International System of Units (SI). This decision, effective from May 20, 2019, established that the SI units of measurement will be defined by means of a set of seven fixed numerical values of natural constants. The kilogram, the basic unit of mass, is no longer defined by a standard prototype, but relies on the Planck constant h. The definitions of the base SI units ampere, kelvin, and mole will also change. This will accomplish the long-term dream of scientists who have been claiming that measurement systems should be based on natural units. In this paper we derive the natural units as combinations of the seven defining natural constants and determine the numerical relations between the natural units and the units of SI. (As Provided).
Anmerkungen	American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail: pubs@aapt.org; Web site: http://aapt.scitation.org/journal/pte
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01