A more accurate value for the Avogadro constant

Abstract

Significant improvements in the method for determining the absolute molar mass of silicon have been achieved and are reported. They have led to a reduction in the uncertainty of the molar mass and hence in its contribution to the uncertainty of a previously published Avogadro constant N/sub A/. The new value for N/sub A/ is almost unchanged at 6.022 136 5/spl times/10/sup 23/ mol/sup -1/ but the uncertainty is reduced to 0.000005 1/spl times/N/sub A/.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>