Comments on redefinition of SI units based on fundamental physical constants with fixed values

2011/02/22 by V. V. Khruschov, Khruschov, V. V.
Chemistry · Decision Sciences · Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Chemical Physics (physics.chem-ph) #Chemical Thermodynamics and Molecular Structure #Classical Physics (physics.class-ph) #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #Radioactive Decay and Measurement Techniques #Scientific Measurement and Uncertainty Evaluation

paper · pdf · doi:10.48550/arxiv.1102.4831

openalex publication_date 2011/02/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Advantages and disadvantages of fixation of fundamental physical constants' values for definition of SI units are considered. The case with a new definition of the mass unit on the base of a fixed value of the Avogadro constant is studied in detail. Criteria on choosing of a optimum FPC set with fixed values for the redefinition of the SI units are suggested. The minimal optimum FPC set that is consistent with the criteria is presented. The set comprises the speed of light, the constant of the ground state hyperfine transition of the caesium-133 atom, the Avogadro constant, the mass of the carbon-12 atom and the absolute magnitude of the electron charge. Comment on the redefinition of the kelvin is also made.

Related

• On new definitions of SI base units. Why is the "atomic" kilogram preferable
• Stepwise redefinition of the SI base units
• Modernizing the SI: implications of recent progress with the fundamental constants
• Alternative set of defining constants for redefinition of four SI units
• On a natural definition of the kilogram and the ampere: the objectives and consequences