Abstract:The triple point of water serves to define the kelvin, the unit of thermodynamic temperature, in the International System of Units (SI). Furthermore, it is the most important fixed point of the International Temperature Scale of 1990 (ITS-90). Any uncertainty in the realization of the triple point of water contributes directly to the measurement uncertainty over the wide temperature range from 13.8033 K to 1234.93 K.The Consultative Committee for Thermometry (CCT) decided at its 21st meeting in 2001 to carry o… Show more
“…Special care was taken for reaching adequate thermal equilibrium in the cell before taking data. The national standard for the triple point of water as maintained at INRiM is well characterized from international comparisons [56,57] with an estimated uncertainty of 20 K. The resistance values for each thermometer were corrected to account for the immersion depth in the cell, self heating and isotopic composition (table 7).…”
Section: Calibration Procedures and Resultsmentioning
We have determined the acoustic and microwave frequencies of a misaligned spherical resonator maintained near the temperature of the triple point of water and filled with helium with carefully characterized molar mass M = (4.002 6032 ± 0.000 0015) g mol
“…Special care was taken for reaching adequate thermal equilibrium in the cell before taking data. The national standard for the triple point of water as maintained at INRiM is well characterized from international comparisons [56,57] with an estimated uncertainty of 20 K. The resistance values for each thermometer were corrected to account for the immersion depth in the cell, self heating and isotopic composition (table 7).…”
Section: Calibration Procedures and Resultsmentioning
We have determined the acoustic and microwave frequencies of a misaligned spherical resonator maintained near the temperature of the triple point of water and filled with helium with carefully characterized molar mass M = (4.002 6032 ± 0.000 0015) g mol
“…In order to create the direct reference to the CCT-K7 key comparison [4] for INTiBS, two water cellsIsotech No. 465 (with known isotopic composition) and UME 51-participated in the bilateral comparison at INRIM in Turin (EURAMET Project No.…”
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