OPINION EDITORIALS


"The Avogadro number is an integer multiple of the number '1' ", by P. de Bièvre, Accred Qual Assur 20:41–42, January 2015
In early civilizations, the question "how much is there?" could be related to a number of cattle, soldiers, days, or denarii ... Read more.

"The mole is an Avogadro number of entities", by B. Leonard, June 2014
Most people seem to agree that the mole is (and should be, as in the current definition) an Avogadro number of entities, where the Avogadro number is the ratio of the gram to the "atomic mass unit"... Read more.

"Constancy and Circularity in the SI", by I. Johansson, June 2014 (replaces "The Avogadro Constant, the Planck Constant, and the New SI")
Abstract The International System of Units (SI) tries to find or construct something that does not change with time and place, since such constancy is the best possible ground for definitions of fundamental measurement units. This problem of constancy has received scant attention within the philosophy of science, but is the topic of the paper... Read more.

"The SI's Base Quantities and Units", by W. Emerson, May 2014 (revised July 2014)
Abstract The author seeks to demonstrate that the much-used, much quoted International System of Units rests on shaky foundations... Read more.

"The SI should not ignore the directional nature of vector quantities", by W. Emerson, April 10, 2014
One of the shortcomings of the International System of Quantities (ISQ) and the International System of Units (SI) is their deliberate restriction to scalar quantities and their units. All their kinds-of-quantities are treated as scalar, yet very many of them are vectors... Read more.

"Two rogue units of the SI: the kelvin and the candela", by W. Emerson, April 7, 2014
Quantities and the expressions of their magnitudes and their units, if any, are effectively defined by three documents: the Vocabulaire Interntaionale de Métrologie 3rd Edition (VIM3) the SI Brochure 8th Edition (SI8) and the International System of Quantities (ISQ). Until the publication of VIM3 every kind of quantity was required to have an associated unit, now defined as 'a real scalar quantity, defined and adopted by convention, with which any quantity of the same kind can be compared to express the ratio of the two quantities as a number (VIM3)'... Read more.

"On the need for analytical chemists... to re-think the mole", by P. De Bièvre, posted July 2013, revised August 2013
The discussion of a possible re-definition of the mole (as well as of the kilogram) is going on since several years in … fairly small circles of persons commonly -but erroneously- called "metrologists" by people in the field. Anybody who makes measurements is a 'metrologist' (see entry 2.2 in [1]). Making the distinction between chemists (and physicists) performing measurements and "metrologists", has caused havoc and confusion over decades ... Read more.

"Some Illogicalities of the SI", by W. Emerson, October 2012
While the CCU and others examine the minutiae of proposals to redefine some of the base units of the SI to make them all 'granular', there is talk of a New SI ... Read more.

"An Exact Value for Avogadro's Number Redux Redux", by R. Fox, January 2012
...Very recently, a new value for Avogadro's number has been published, based on the silicon sphere method using highly enriched silicon (Si)...Read more..

"The New SI - Draft definitions of the SI Base Units", by A. Thor, February 2012
The above issue has been intensively discussed internationally, not least in our informal network. Before the CGPM 2011 the Swedish delegation discussed the Draft Resolutions of the SI Base units. The Swedish delegation submitted the following comments to the CGPM through CIPM...Read more.


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