A method is presented for analyzing the temperature intervals of the NBS (1955) temperature scale and the International Practical Temperature Scale (IPTS). Values of as a function of resistance are derived from equations of and , obtained from precise heat-capacity data (better than ± 0.02 percent) by the method of least squares. An adjusted temperature scale is obtained by integration of the values of relative to a reference temperature and the corresponding resistance of the thermometer. The results of the adjusting process in the neighborhood of the oxygen point (90.18 °K) are discussed and compared with the existing temperature scales. The derived temperature scale was found to be similar to the scales maintained by the Pennsylvania State University (PSU), the Physico-Technical and Radio-Technical Measurements Institute (PRMI), and the National Physical Laboratory (NPL) from the upper limits of these scales, near 90 °K, down to 50 °K. The adjusting method presented is limited by the uncertainty of formulation of and and the derived temperature scale is limited by the accumulated uncertainty in the integral of .
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6610360 | PMC |
| http://dx.doi.org/10.6028/jres.069A.002 | DOI Listing |
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