Conclusions
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1)
For the study of the reproducibility of the change of phase temperatures of solid oxygen a calorimetric method was suggested and a simplified vacuum calorimeter was made with a compensation of heat losses, thus providing a temperature variation in the calorimeter < 0.001–0.0006°/min.
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2)
By means of this technique the phase-change temperatures suitable for thermometry can be produced with an error up to 0.004°.
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3)
Numerical values for change of phase temperatures of solid oxygen and at the triple point were obtained in terms of the practical VNIIFTRI scale.
The numerical values in degrees of the thermodynamic scale are determined with the accuracy of the formula, which accounts for the possible difference between the practical and thermodynamic scales, and the possible variation in the boiling temperature of oxygen.
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Orlova, M.P. Reproducibility of the change of phase temperature of solid oxygen. Meas Tech 4, 115–119 (1961). https://doi.org/10.1007/BF00978230
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DOI: https://doi.org/10.1007/BF00978230