Abstract
The new International Practical Temperature Scale of 1968 (IPTS-68) was approved by the Comité International des Poids et Mesures in 1968 and put into force by the National Physical Laboratory on January 1 this year. This revision of the IPTS-48 achieves the two objectives of making it agree with thermodynamic temperature values and of extending its range down to 13.81 K.
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References
Cohen, E. R., and du Mond, J. W., Rev. Mod. Phys., 37, 537 (1965).
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BARBER, C. International Practical Temperature Scale of 1968. Nature 222, 929–931 (1969). https://doi.org/10.1038/222929a0
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DOI: https://doi.org/10.1038/222929a0
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