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What exactly are the new definitions of kilogram and other SI units? (CROSBI ID 265952)

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Lopac, Vjera ; Hrupec, Dario What exactly are the new definitions of kilogram and other SI units? // Physics teacher, 58 (2020), 58; 58-60. doi: 10.1119/1.5141976

Podaci o odgovornosti

Lopac, Vjera ; Hrupec, Dario

engleski

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

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.

SI units ; redefinition of SI ; natural units ; kilogram

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Podaci o izdanju

58 (58)

2020.

58-60

objavljeno

0031-921X

1943-4928

10.1119/1.5141976

Povezanost rada

Fizika, Interdisciplinarne prirodne znanosti, Interdisciplinarne tehničke znanosti

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