Доклад на 15 Международной конференции по свойствам воды и водяного пара
Thermophysical properties measured before 1990 are based on obsolete temperature scales. In spite of great progress of experimental technique, there are data measured before 1990 that are still considered as very precious. In similar way it is with correlations of old but reliable thermophysical data. The only change of a parameter, as critical temperature, does not guarantee a correct approach to the right conversion. Comparison of values from an equation based on obsolete temperature scale with a new equation calculated for the same numerical values of temperature gives comparison at two different thermal states. There are thermophysical properties the temperature conversion of which depends on derivatives of equation converting an old temperature scale to the new one. Specific heat capacity, coefficient of thermal conductivity etc. could serve as examples of such properties. Complicated situation is with such properties as entropy and properties derived from it. The paper brings discussion of examples of temperature conversion of experimental data and equations as well.
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