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The International Temperature Scale of 1990, ITS-90
Units of Temperature and Introduction from Metrologia 27, 3-10 (1990)
  Principles of the International Temperature Scale of 1990 (ITS-90)
  Definition of the International Temperature Scale of 1990
  Supplementary Information and Differences from Earlier Scales & Appendix

ITS-90 Tables

  1. Defining Fixed Points of the ITS-90

  2. Effect of pressure on the temperatures of some defining fixed points

  3. Values of the constants for the helium vapour pressure Eq3 (3), and the temperature range for which each equation, identified by its set of constants, is valid.

  4. The constants A0, Ai, Bi, Co, Ci, D0 and Di in the reference functions of equations (9a);(9b);(10a) and (10b) respectively

  5. Deviation functions and calibration points for platinum resistance thermometers in the various ranges in which they define T90

  6. Difference between ITS-90 and EPT-76, and between ITS-90 and IPTS-68 for specified values of T90 and t90

Note

The official French text of the ITS-90 is published by the BIPM as part of the Prochès-verbaux of the Comité International des Poids et Mesures (CIPM). An English version appeared in Metrologia, 1990, 27, 3-10. (This text was later corrected).

The version appearing on this site is based on that of Metrologia.

The document has been converted to HTML for web use, you will need a recent web browser for the document to display correctly.

Although checked carefully errors and omissions may be found, for which we can accept no responsibility

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