Criticisms of the proposed “new SI”

Hill, Theodore P.

doi:10.1007/s00769-011-0810-1

Cited by 9 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In Ref. [51] potentially serious flaws of the proposed new SI have been listed, ranging from 'wrong definitions of the mole', the fact that the redefinition of the kilogram relies on special relativity and quantum mechanics and that the redefinitions of the SI units are inconsistent, circular (see also [52]) or even wrong [51].…”

Section: Review Of Selected Papers and Summary Of Key Issues Raised Bmentioning

confidence: 99%

A critical review of the proposed definitions of fundamental chemical quantities and their impact on chemical communities (IUPAC Technical Report)

Marquardt

Meija

Mester

et al. 2017

Pure and Applied Chemistry

View full text Add to dashboard Cite

Abstract:In the proposed new SI, the kilogram will be redefined in terms of the Planck constant and the mole will be redefined in terms of the Avogadro constant. These redefinitions will have some consequences for measurements in chemistry. The goal of the Mole Project (IUPAC Project Number 2013-048-1-100) was to compile published work related to the definition of the quantity 'amount of substance', its unit the 'mole', and the consequence of these definitions on the unit of the quantity mass, the kilogram. The published work has been reviewed critically with the aim of assembling all possible aspects in order to enable IUPAC to judge the adequateness of the existing definitions or new proposals. Compilation and critical review relies on the broadest spectrum of interested IUPAC members.

show abstract

Section: Review Of Selected Papers and Summary Of Key Issues Raised Bmentioning

confidence: 99%

A critical review of the proposed definitions of fundamental chemical quantities and their impact on chemical communities (IUPAC Technical Report)

Marquardt

Meija

Mester

et al. 2017

Pure and Applied Chemistry

View full text Add to dashboard Cite

show abstract

“…Hill [27] also gave a list of eight serious flaws in the new SI and noted the censorship and suppression of such inconvenient matters by the International Bureau of Weights and Measures (BIPM) and the Consultative Committee on Units.…”

Section: Some Disquiet Concerning the New Simentioning

confidence: 99%

No prospect for change

Price¹

2011

Accred Qual Assur

View full text Add to dashboard Cite

A recent discussion by Martin Milton in the November issue of this journal was critical of many published objections to the proposed new International System (SI) measurement units (and in particular the definition of the mole) on the grounds that many objectors had proposed new terms in attempts to clarify thinking and that it is impractical to achieve consensus on such proposals. This discussion in response argues that those criticisms miss the point of the objectors' arguments and are perhaps more appropriately directed at both the current and the new SI itself. A primary example of a neologism in the SI is the term ''amount of substance.'' The many substantive problems with the new SI remain unaddressed by its proponents. Many important consequences of exactly fixing multiple inter-dependent fundamental physical constants as the basis of the world's measurements would appear not to have been considered by the global institutions responsible for the world's measurement units.

show abstract

“…Although it seems likely that students and non-metrologist members of the wider scientific and user community would understand and prefer this definition in terms of a real physical atomic mass [9,10], the CGPM, on the basis of a proposal from the CCU, approved by the CIPM, has endorsed the less easily comprehended fixed-Planck-constant definitionsince, in combination with the proposed redefinition of the ampere that fixes the numerical value of the elementary charge, e, this guarantees that certain quantum-electronic parameters (specifically, the von Klitzing constant, R K = h/e 2 , and the Josephson constant, K J = 2e/ h) and a number of related quantities will have exact numerical values [3]. The Planck constant and the atomic mass of carbon 12 are related by…”

Section: The Alternative Carbon-12-based Kilogrammentioning

confidence: 99%

Why the dalton should be redefined exactly in terms of the kilogram

Leonard

2012

Metrologia

View full text Add to dashboard Cite

With a redefined kilogram fixing the Planck constant, h, and a redefined mole fixing the Avogadro constant, N A , as recently proposed, retaining the carbon-12-based dalton creates a fundamental incompatibility in the stoichiometric equations. To avoid this incompatibility, the dalton should be redefined, as well: exactly in terms of the fixed-h kilogram. Specifically, with the mole defined as mol = N * /N A , where N * is an exact dimensionless constant, the dalton should be redefined as Da = (1/1000N *) kg, exactly, so that N A /mol −1 remains exactly equal to the gram-to-dalton mass-unit ratio-as required by the fundamental compatibility condition relating the kilogram, mole and dalton. This would necessarily decouple the dalton from the carbon-12 reference mass, m a (12 C)/12, used for cataloguing nuclidic mass ratios to extremely high precision. Relative atomic masses, defined as A r (X) = m a (X)/Da, would then have uncertainties dominated by that of m a (12 C)/kg; but since this would be of order 10 −9 or less, the values of relative atomic masses, to the precision used in stoichiometry, would be totally unaffected. This is a much more straightforward and easily comprehended strategy than those using confusing inexact correction factors or the equivalent, as recommended in recent publications and implicitly endorsed by the CGPM.

show abstract

Criticisms of the proposed “new SI”

Cited by 9 publications

References 9 publications

A critical review of the proposed definitions of fundamental chemical quantities and their impact on chemical communities (IUPAC Technical Report)

A critical review of the proposed definitions of fundamental chemical quantities and their impact on chemical communities (IUPAC Technical Report)

No prospect for change

Why the dalton should be redefined exactly in terms of the kilogram

Contact Info

Product

Resources

About