Title :
Mass measurement of 1-kg silicon spheres for the precise determination of the Avogadro constant at the NMIJ
Author :
Mizushima, Shigeki ; Kuramoto, Naoki ; Ueda, Kazunori ; Fujii, Kenichi
Author_Institution :
Nat. Metrol. Inst. of Japan (NMIJ), AIST, Tsukuba, Japan
Abstract :
Mass measurement of 1-kg single-crystal silicon spheres is important for precise determination of the Avogadro constant. We describe the mass measurement method and its uncertainty evaluation at the NMIJ. In addition, we report the measurement of the physical adsorption of water vapor on the surface of the silicon sphere. We also report the comparative results of 1-kg mass measurement carried out six times at the NMIJ and the BIPM from 1996 to 2006 to confirm the reliability of our mass measurement.
Keywords :
adsorption; constants; elemental semiconductors; mass measurement; measurement uncertainty; reliability; silicon; Avogadro constant; NMIJ; Si; mass 1 kg; mass measurement method; physical adsorption measurement; reliability; single-crystal silicon sphere; water vapor; Adsorption; Atmospheric measurements; Silicon; Standards; Steel; Uncertainty; Weight measurement; Avogadro constant; Mass measurement; silicon sphere;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898424
