Abstract
Determination of the differences between the Kelvin Thermodynamic Temperature Scale (KTTS) and the International Practical Temperature Scale of 1968 (IPTS-68) in the range from 230°C to 660°C has been accomplished by gas thermometry. The estimated random uncertainty of the results ranges from ±0.005°C to ±0.008°C; the major uncertainties appear to lie in the determination of the volume of the gas bulb and the determination of its IPTS-68 temperature. The present results differ noticeably from earlier gas-thermometric determinations in the range of temperature overlap. The value found for the thermodynamic temperature of the freezing point of Al is (660.342 ± 0.015)°C.
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