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Modelling and measurand identification for the Mise en Pratique of the kelvin
Author(s) -
Pavese F.,
Ichim D.
Publication year - 2007
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200700519
Subject(s) - variety (cybernetics) , identification (biology) , range (aeronautics) , computer science , mathematics , statistics , engineering , aerospace engineering , botany , biology
A big variety of modelling requirements corresponds to the variety of definitions allowed by the ‘mise en pratique’ of the kelvin. They range from thermodynamic ones, requiring a correct physical modelling, to semi‐empirical, to empirical ones. Since temperature can be measured only by measuring another physical quantity, e.g., electrical resistance, pressure, a change in length, etc., the measurand related to each of the above definition must be correctly and clearly identified, which can be less obvious than it might look. The paper is introducing the general thermometric problem, limited to making the subsequent illustration of the problems concerning measurand identification and modelling issues understandable. Then it summarises, mainly referring to the literature, the procedures to correctly and clearly identify the measurand of each given definition, with examples of possible ambiguities, and illustrates the characteristics of the main families of models suitable for use in temperature scales, used or candidates for use as ‘mises en pratique’ of the kelvin, from the viewpoint of the metrologist, concerning either the mathematical requirements and the requirements of the statistical treatment of the experimental temperature data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)