A Report on the International Practical Temperature Scale of 1968

Abstract

This report summarizes the essential parts of the International Practical Temperature Scale of 1968, indicates the differences from the International Practical Temperature Scale of 1948, as amended in 1960, and discusses the problern of conversion of temperatures and certain calorimetric data obtained under the previous scale.CONTENTS l. lntroduction 2. Basis of the International Practical Temperature Scale of 1968 3. Defining point: triple point of water 4. Difference between the triple and freezing points of water 5.Primary fixed points 6. Secondary fixed points 7. Thermometrie systems 8. Realization of the scale over the range 13•810 to 903•89K 9. Realization of the scale over the range 903•89 to 1337•58K 10.Realization of the scale above 133 7•58K 11.Recommendations regarding apparatus, methods and procedures 12. Numerical differences between the International Practical Temperature Scale of 1968 and that of 1948 13.The problern of converting existing calorimetrically determined data to the basis of the International Practical Temperature Scale of 1968.(a) Conversion of calorimetric data on enthalpy (b) Conversion of calorimetric data on heat capacity (c) Conversion of calorimetric data on entropy 14.Conversion of P-V-T data to the basis of the International Practical Temperature Scale of 1968 15.Thermodynamic properties calculated statistically 16.Conclusion References

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