The revision of the SI—the result of three decades of progress in metrology
M Stock, R Davis, E de Mirandés, MJT Milton - Metrologia, 2019 - iopscience.iop.org
On 16 November 2018 a revision of the International System of Units (the SI) was agreed by
the General Conference on Weights and Measures. The definitions of the base units were …
the General Conference on Weights and Measures. The definitions of the base units were …
New measurement of the Boltzmann constant k by acoustic thermometry of helium-4 gas
The SI unit of temperature will soon be redefined in terms of a fixed value of the Boltzmann
constant k derived from an ensemble of measurements worldwide. We report on a new …
constant k derived from an ensemble of measurements worldwide. We report on a new …
Advances in thermometry
The past 25 years have seen tremendous progress in thermometry across the moderate
temperature range of 1 K to 1,235 K. Various primary thermometers, based on a wide range …
temperature range of 1 K to 1,235 K. Various primary thermometers, based on a wide range …
A determination of the molar gas constant R by acoustic thermometry in helium
RM Gavioso, DM Ripa, PPM Steur, C Gaiser… - Metrologia, 2015 - iopscience.iop.org
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 …
resonator maintained near the temperature of the triple point of water and filled with helium …
Improved electronic measurement of the Boltzmann constant by Johnson noise thermometry
The unit of thermodynamic temperature, the kelvin, will be redefined in 2018 by fixing the
value of the Boltzmann constant, k. The present CODATA recommended value of k is …
value of the Boltzmann constant, k. The present CODATA recommended value of k is …
[PDF][PDF] Standard platinum resistance thermometer calibrations from the Ar TP to the Ag FP
GF Strouse - NIST Special Publication, 2008 - nvlpubs.nist.gov
The National Institute of Standards and Technology (NIST) is in charge of realizing,
maintaining, and disseminating the International Scale of 1990 (ITS-90)[1-5]. The Standard …
maintaining, and disseminating the International Scale of 1990 (ITS-90)[1-5]. The Standard …
Volume measurements of 28Si spheres using an interferometer with a flat etalon to determine the Avogadro constant
N Kuramoto, K Fujii, K Yamazawa - Metrologia, 2011 - iopscience.iop.org
The volumes of two 1 kg silicon spheres, AVO28-S5 and AVO28-S8, fabricated from a 28 Si-
enriched crystal were measured to determine the Avogadro constant by the x-ray crystal …
enriched crystal were measured to determine the Avogadro constant by the x-ray crystal …
[HTML][HTML] Comparison of triple point of water cells with isotopic composition between NIM and PTB
X Yan, S Rudtsch, L Bünger, P Qiu, J Zhang - Measurement: Sensors, 2024 - Elsevier
The triple point of water (TPW) is the most important defining fixed point on the International
Temperature Scale of 1990 (ITS-90), because the uncertainty in the realization of the TPW is …
Temperature Scale of 1990 (ITS-90), because the uncertainty in the realization of the TPW is …
Measurement of pressures up to 7 MPa applying pressure balances for dielectric-constant gas thermometry
T Zandt, W Sabuga, C Gaiser, B Fellmuth - Metrologia, 2015 - iopscience.iop.org
For the determination of the Boltzmann constant by dielectric-constant gas thermometry, the
uncertainty of pressure measurements in helium up to 7 MPa has been decreased …
uncertainty of pressure measurements in helium up to 7 MPa has been decreased …
Uncertainty propagation of atomic weight measurement results
General theory for uncertainty propagations of atomic weight measurement results is
presented and the impact of correlation of input variables (isotope ratios and correction …
presented and the impact of correlation of input variables (isotope ratios and correction …