techniques for approximating the international temperature ... - BIPM
techniques for approximating the international temperature ... - BIPM techniques for approximating the international temperature ... - BIPM
xiii Foreword This monograph, published by the Bureau International des Poids et Mesures (BIPM), has been compiled by the Comité Consultatif de Thermométrie, one of the eight consultative committees established by the Comité International des Poids et Mesures. The approximations to the International Temperature Scale of 1990 described here provide levels of accuracy that are adequate for the great majority of thermometric requirements, and in general do so with greater convenience or at lower cost than would be the case in realizing the ITS-90 itself. Thermometrists who do require the accuracy only available from, or the imprimatur of, the ITS-90 are referred to the text of that scale and, more particularly, to the companion monograph to this one: "Supplementary Information for the ITS-90", also published by the BIPM in 1990. The Comité Consultatif de Thermométrie expects to update both monographs periodically, probably at intervals of the order of five to eight years. H. PRESTON- THOMAS T.J. QUINN President, CCT Director, BIPM July 1990
xiv Acknowledgments This monograph has been prepared by the Working Group of the Comité Consultatif de Thermométrie (CCT) identified hereunder. Although a large part of the material originated with members of this Working Group, much also was originally contributed by colleagues, either in our laboratories, or in other National Standards Laboratories. In addition, (parts of) various drafts underwent critical review by some members of the CCT and thermometry groups. We thank all of these people for their assistance, and express special appreciation to H. Ronsin (Institut National de Métrologie, France), B. Fellmuth (Amt für Standardisierung Messwesen und Warenprüfung, German Democratic Republic), L. Crovini (Istituto di Metrologia "G. Colonnetti", Italy), R.P. Hudson (then of Bureau International des Poids et Mesures, Paris), R. Rusby (National Physical Laboratory, United Kingdom), and members of the Temperature and Pressure Section (National Bureau of Standards, United States of America). We also thank Mrs. P. Vineham (National Research Council of Canada) for having typed so excellently and so patiently the several successive drafts of this monograph. Working Group 2: R.E. Bedford, National Research Council of Canada Chairman G. Bonnier, Institut National de Métrologie, France H. Maas, Amt für Standardisierung Messwessen und Warenprüfung, German Democratic Republic F. Pavese, Istituto di Metrologia “G. Colonnetti”, Italy.
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- Page 19 and 20: xviii 11.3 Thermal Contact 111 11.4
- Page 21 and 22: 1 1. Introduction The Comité Consu
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- Page 29 and 30: PART 1: TECHNIQUES AND THERMOMETERS
- Page 31 and 32: 11 Fig. 2.1: One form of apparatus
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- Page 39 and 40: 19 Fig. 2.5: Schematic drawing of a
- Page 41 and 42: 21 device SRM 767 [Schooley et al.
- Page 43 and 44: 23 Table 3.1 : Current Best Estimat
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- Page 48 and 49: 28 fraction of sample melted) can g
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xiii<br />
Foreword<br />
This monograph, published by <strong>the</strong> Bureau International des Poids et Mesures<br />
(<strong>BIPM</strong>), has been compiled by <strong>the</strong> Comité Consultatif de Thermométrie, one of <strong>the</strong><br />
eight consultative committees established by <strong>the</strong> Comité International des Poids et<br />
Mesures.<br />
The approximations to <strong>the</strong> International Temperature Scale of 1990 described<br />
here provide levels of accuracy that are adequate <strong>for</strong> <strong>the</strong> great majority of<br />
<strong>the</strong>rmometric requirements, and in general do so with greater convenience or at lower<br />
cost than would be <strong>the</strong> case in realizing <strong>the</strong> ITS-90 itself. Thermometrists who do<br />
require <strong>the</strong> accuracy only available from, or <strong>the</strong> imprimatur of, <strong>the</strong> ITS-90 are referred<br />
to <strong>the</strong> text of that scale and, more particularly, to <strong>the</strong> companion monograph to this<br />
one: "Supplementary In<strong>for</strong>mation <strong>for</strong> <strong>the</strong> ITS-90", also published by <strong>the</strong> <strong>BIPM</strong> in 1990.<br />
The Comité Consultatif de Thermométrie expects to update both monographs<br />
periodically, probably at intervals of <strong>the</strong> order of five to eight years.<br />
H. PRESTON- THOMAS T.J. QUINN<br />
President, CCT Director, <strong>BIPM</strong><br />
July 1990
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