Comparison of Solid Density Standards Between IMGC and NBS.

Abstract

Solid-object density standards developed independently by the Istituto di Metrologia "G. Colonnetti" (IMGC) and NBS, and traceable to SI units of length and mass, have been compared using a silicon transfer standard. Results agree to approximately 1×10^-6, which is conistent with the uncertainties assigned by the two laboratories.