Recommended Values of Temperature for a Selected Set of Secondary Reference Points

Bedford, R. E.; Bonnier, G.; Maas, Han L. J. van der; Pavese, Franco

doi:10.1088/0026-1394/20/4/003

Cited by 54 publications

(22 citation statements)

References 66 publications

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“…LGC b 0.99999 933.473 (10,11) 933.607 (14,15) a HMI = Hollandse Metallurgische Industrie, the Netherlands. b LGC = The Laboratory of the Government Chemist, UK.…”

Section: Temperature Calibration and Measurementmentioning

confidence: 99%

Heat capacity of the reference material synthetic sapphire (α-Al2O3) at temperatures from 298.15 K to 1000 K by adiabatic calorimetry. Increased accuracy and precision through improved instrumentation and computer control

Stølen

Glöckner

Grønvold

1996

The Journal of Chemical Thermodynamics

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“…LGC b 0.99999 933.473 (10,11) 933.607 (14,15) a HMI = Hollandse Metallurgische Industrie, the Netherlands. b LGC = The Laboratory of the Government Chemist, UK.…”

Section: Temperature Calibration and Measurementmentioning

confidence: 99%

Heat capacity of the reference material synthetic sapphire (α-Al2O3) at temperatures from 298.15 K to 1000 K by adiabatic calorimetry. Increased accuracy and precision through improved instrumentation and computer control

Stølen

Glöckner

Grønvold

1996

The Journal of Chemical Thermodynamics

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“…Sublimation pressures of CO 2 have been measured by Bedford et al, Bilkadi et al, Bryson et al, Ambrose, Giauque and Egan, and Fernandez-Fassnacht and del Rio . Span and Wagner established an accurate correlation equation for the sublimation pressure, based on selected experimental data.…”

Section: Resultsmentioning

confidence: 99%

Equation of State for Solid Carbon Dioxide Based on the Gibbs Free Energy

Jäger

Span

2012

J. Chem. Eng. Data

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In this work a fundamental equation of state explicit in the Gibbs free energy was established, which was fitted to experimental data (heat capacity, molar volume, expansion coefficient, and compressibility) of solid carbon dioxide. Almost all of the data that the equation was fitted to are represented within the experimental uncertainty given by the authors. However, only very limited data for the thermodynamic properties of solid carbon dioxide are available. The new equation behaves physically reasonably within its range of validity. Sublimation and melting pressures of dry ice are predicted accurately using Gibbs energies calculated from the new dry ice equation and from the fundamental equation by Span and Wagner for the fluid phase (J. Phys. Chem. Data 1996, 25, 1509À1596). The results agree with those of the reference equations for sublimation and melting pressure published by Span and Wagner mostly within the uncertainty given for these equations. The resulting sublimation and melting pressures are very sensitive to variations of the Gibbs energy. The use of another equation of state for the fluid phase has a significant impact on the calculated equilibrium pressures. It is shown that the equation for dry ice also might be used for the calculation of equilibria with dry ice in the solid phase and mixtures in the fluid phase.

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“…Therefore, both types of non-uniqueness are expected to benefit from the use of an alternative fixed point situated about halfway between ArTP and WTP. The trend in recent years toward increasingly restrictive regulations around the transportation and use of Mercury has also spurred a search for suitable alternatives to the MTP using more benign materials [see, for example, [8][9][10]. Unfortunately, neither SF 6 nor CO 2 resolve the problem related to the closeness to the WTP.…”

Section: Introductionmentioning

confidence: 99%

Comparison of xenon triple point realizations

2018

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It is widely recognized that the Mercury triple point being situated very close to the Water triple point constitutes a weakness in the International Temperature Scale of 1990 (ITS-90), in addition to safety concerns related to the use and transportation of Mercury. As such, a substitution for a safer, highquality fixed point about half way between the Argon and Water triple points would be highly desirable. Now, a direct comparison is described of a Xenon cell filled in 2005 by the National Research Council Canada (NRC) and a more recently produced cell of the Istituto Nazionale di Ricerca Metrologica (INRIM). The present paper discusses the INRiM 2017 measurements on both the INRiM and NRC cells, with a follow-up measurement at NRC, and presents the difference between the two cells, (0.17 ± 0.08) mK with the uncertainties of each cell's realization of the Xenon triple point, 0.11 mK for the INRiM cell and 0.07 mK for the NRC cell (k = 1). In addition, the effect of substituting Mercury with Xenon on Type 1 non-uniqueness ("SRI," subrange inconsistency), Type 3 non-uniqueness ("NU3," cSPRT variability) and propagation of fixed point realization uncertainty is shown and discussed.

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Recommended Values of Temperature for a Selected Set of Secondary Reference Points

Cited by 54 publications

References 66 publications

Heat capacity of the reference material synthetic sapphire (α-Al2O3) at temperatures from 298.15 K to 1000 K by adiabatic calorimetry. Increased accuracy and precision through improved instrumentation and computer control

Heat capacity of the reference material synthetic sapphire (α-Al2O3) at temperatures from 298.15 K to 1000 K by adiabatic calorimetry. Increased accuracy and precision through improved instrumentation and computer control

Equation of State for Solid Carbon Dioxide Based on the Gibbs Free Energy

Comparison of xenon triple point realizations

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