Naslov
What exactly are the new definitions of kilogram and other SI units?

Autori
Lopac, Vjera ; Hrupec, Dario

Izvornik
Physics teacher (0031-921X) 58 (2020), 58; 58-60

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
SI units ; redefinition of SI ; natural units ; kilogram

Sažetak
On 16 November 2018, at the 26th meeting of the General Conference on Weights and Measures (CGPM), a resolution was adopted which is introducing historical changes into the International System of Units (SI). This decision, effective from 20 May 2019, established that the SI units of measurement will be defined by means of a set of seven fixed numerical values of natural constants. 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Interdisciplinarne prirodne znanosti, Interdisciplinarne tehničke znanosti

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