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.

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

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