Recommendation 5 of the 82nd CIPM (1993)

Thermodynamic temperature measurements

The Comité International des Poids et Mesures,


  • the importance of accurate measurements of thermodynamic temperature, as emphasized in Recommendation T 1 (1987),
  • the inconsistencies which still exist in determinations of thermodynamic temperature, especially in the regions near 150 K, 700 K and at higher temperatures,
  • the desirability of extending the range of the International Temperature Scale of 1990 (ITS-90) below its present lower limit of 0,65 K,
  • the importance of the national laboratories and the Bureau International des Poids et Mesures having a capability for thermodynamic temperature measurements using a variety of techniques,

recommends that national laboratories pursue fundamental research in thermometry, and in particular the measurement of thermodynamic temperature in the ranges referred to above.

DOI : 10.59161/CIPM1993REC5E

The reader should note that the official version of this Resolution is the French text

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