Molten Salts Data as Reference Standards for Density, Surface Tension, Viscosity, and Electrical Conductance: KNO3 and NaCl

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Abstract
Accuracy estimates for physical property measurements are usually based on somewhat subjective quality judgements and the difficulties encountered in interpreting accuracy statements in the literature are frequently compounded through lack of details on the methods of measurements, chemical purity, and related experimental aspects. In the present communication we report the results of a Standards Program initiated in 1973 with participating laboratories in Czechosloskia, German Democratic Republic‐DDR, Japan, Norway, Poland, Rumania, and U.S.A. Potassium nitrate (m.335 °C) and sodium chloride (m 800 °C) were selected as the two reference salts for the properties: density, surface tension, viscosity, and electrical conductance. The results of the measurements have been critically examined, and are reported herewith. It has been possible to resolve some of the difficulties encountered in accuracy estimates through this ’’round‐robin’’ series of measurements, and to up‐grade some of the data‐sets to calibration‐quality reference standards.

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