Reproducibility of the Temperature of the Ice Point in Routine Measurements

摘要

This note presents results on the reproducibility and temperature of the icepoint of water. The data were obtained over the years 1963 to 1970, in 1992 and in 1995. The data from 1963 to 1970 are from resistance measurements of a standard platinum resistance thermometer in ice points, made for the purpose of obtaining the reference value for the thermometer to be used for determining temperatures of calibration of liquid-in-glass thermometers. In 1992 and in 1995, measurements of the temperature of the ice point were made, using water (and ice) from different sources. The value of the temperature determined for the ice point prepared from the authors' highest-purity water is in excellent agreement with that determined previously. Also, the reproducibility of routine measurements at the ice point are consistent with what has been generally accepted, but heretofore undocumented.