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International Practical Temperature Scale

1

Terminological databases

Metroloogia terminibaas

ID 573308 Last modified 21.03.2026
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Domain Standardisation - Metrologymeasuring procedures
  • skaala, mis on üles ehitatud rea reeperpunktide ja interpoleerimisprotseduuride alusel, mis on määratud rahvusvaheliste leppimustega
  • temperature scale adopted by the International Committee on Weights and Measures (CIPM) in 1989 for the purpose of practical measurements
  • defined to conform as closely as possible to the termodynamic temperature scale, by using a set of 17 reference materials, prescribed measuring instruments, and interpolation equations according to an internationally accepted convetion
rahvusvaheline praktiline temperatuuriskaala ITS-90 preferred
Usage examples
  • 2019. aastal määratleti kelvin uuesti, kuid võrreldes rahvusvahelise praktilise temperatuuriskaala ITS-90 määramatusega oli muudatus siiski väga väike ja seega jäi rahvusvaheline praktiline temperatuuriskaala ITS-90 soovitatavaks praktiliseks temperatuuriskaalaks oluliste muudatusteta, kuna eeldatakse, et ümbermääratlemine koos esmaste temperatuurimõõtmise meetodite täiustamisega lõpetab tulevikus järk-järgult rahvusvahelise praktilise temperatuuriskaala ITS-90 kasutamise.
ITS-90 symbol
International Temperature Scale of 1990 preferred
Usage examples
  • In 2019, the kelvin was redefined. However, the alteration was very slight compared to the International Temperature Scale of 1990 uncertainties, and so the International Temperature Scale of 1990 remains the recommended practical temperature scale without any significant changes. It is anticipated that the redefinition, combined with improvements in primary thermometry methods, will phase out reliance on the International Temperature Scale of 1990 in the future.
ITS-90 symbol

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in the EU's IATE term base

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