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The triple point of indium is realized using an air bath furnace and a sealed glass cell. The triple point temperature of indium is determined, based on the ITS-90, to be 429.74347 (0.00005)K, which is estimated from the measurement of the pressure dependency of the liquid-solid equilibrium state. The reproducibility of the melting curves, the difference between the melting and freezing curves of the triple point of indium, and the immersion effect are measured to confirm thermal equilibrium between the sample and a thermometer in the thermometer well and to esimate spurious heat flows. The molar impurity concentration effective to the triple point in the indium sample is found to be less than 0.01ppm estimated by the thermal analytical method using a quasi-static freezing curve. The combined uncertainty in calibrating thermometers by the developed equipment is estimated to be 0.068mK.

Realization of the Triple Point of Indium Using an Air Bath Furnace