Abstract
The reproducibility of the triple-point temperature of gallium was investigated using two standard platinum resistance thermometers.
The sample of high purity gallium from commercial sorce was in all-plastic cell, and it was set in the constant temperature oil bath, the temperature of which was kept approximately 0.5°C above the gallium triple-point temperature. During the triple-point measurements, the cell was pumped continuously.
The triple-point temperature was found to be stable, not depending on the temperature of the oil bath. The immersion characteristics were studied, and effect of the temperature outside the cell was as small as 0.01mK. The triple-point temperatures were reproducible with a standard deviation ±0.03mK.
