Abstract
A new density comparison apparatus based on a pressure-of-flotation method (PFM) is presented. Density comparison measurements are performed for a new silicon crystal of the National Metrology Institute of Japan (NMIJ) for the density standard and determination of the Avogadro constant. The density comparison measurement of silicon crystals by the new PFM apparatus has an estimated relative standard uncertainty of 4.0 × 10−8. Adjusted values of density are evaluated from the data of the PFM and absolute measurements using a least-squares algorithm, where correlations are taken into consideration.
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