Article1979

On the IPTS-68 Temperature Value of the Triple Point of Methane

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Scientific Measurement and Uncertainty Evaluation Calibration and Measurement Techniques Advanced Sensor Technologies Research

Abstract

From accurate measurements on a set of sealed cells, each reproducible to within ±0.2 mK, the temperature value for the triple point of methane was found to be 90.6856 K, with a range of 1 mK depending on which one of ten thermometers was used. All thermometers were calibrated on IPTS-68 using T(Ar) = 83.798 K. On the contrary, when IPTS-68 calibration of the same thermometers was considered, based on the condensation point of oxygen as realized in different laboratories, a spread of 3.6 mK was found for the values of both the argon and the methane triple points.

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1976The International Practical Temperature Scale of 1968 Amended Edition of 1975 1978The Triple Point of Argon and Oxygen

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1979The triple point of pure normal-deuterium 1980Points Triples de l'Argon et du Méthane: Utilisation de Cellules Scellées

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