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- Title
ON THE FIVE BASE QUANTITIES OF NATURE AND SI (THE INTERNATIONAL SYSTEM OF UNITS).
- Authors
Kaptay, G.
- Abstract
It is shown here that five base quantities (and the corresponding five base units) of nature are sufficient to define all derived quantities (and their units) and to describe all natural phenomena. The base quantities (and their base units) are: length (m), mass (kg), time (s), temperature (K) and electric charge (C). The amount of substance (mole) is not taken as a base quantity of nature and the Avogadro constant is not considered as a fundamental constant of nature, as they are both based on an arbitrary definition (due to the arbitrary value of 0.012 kgfor the mass of 1 mole of C-12 isotope). Therefore, the amount of substance (mole) is movedfrom the list of base quantities to the category of the supplementary units (to be re-created after its abrogation in 1995). Based on its definition, the luminous intensity (cd) is not a base quantity (unit), therefore it is moved to the list of derived quantities (units). The ampere and coulomb are exchanged by places in the list of base and derived units, as ampere is a speed of coulombs (but SI defines meter, not its speed as a base unit). The five base quantities are re-defined in this paper by connecting them to five fundamental constants of nature (the most accurately known frequency of the hydrogen atom, the speed of light, the Planck constant, the Boltzmann constant and the elementary charge) with their numerical values fixed in accordance with their CODA TA 2006 values (to be improved by further experiments).
- Subjects
METRIC system; AVOGADRO constant; UNITS of measurement; HYDROGEN; EXPERIMENTS
- Publication
Journal of Mining & Metallurgy. Section B: Metallurgy, 2011, Vol 47, Issue 2, p241
- ISSN
1450-5339
- Publication type
Article
- DOI
10.2298/JMMB110620015K