Abstract
This study was made as a contribution to the information that was required to define an International Practical Temperature Scale between 90.2 K and 13.8 K by using a relation between the resistance ratio W( T) = R( T)/ R (O°C) of platinum and the temperature. Three different methods for the interpolation of differences in resistance ratios (Δ W) have been applied to experimental data of 8 thermometers. Between the boiling point and the triple point of oxygen the accuracy of the interpolation is within 1 mK, between the triple point of oxygen and the boiling point of hydrogen interpolation within 2 mK is possible and between the boiling point and the triple point of hydrogen interpolation within 2 mK is possible if a calibration point near 17 K is indluded. The extrapolation below 13.8 K diverges rapidly.
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