Abstract
The development of a new density comparison measurement system forsilicon crystals using the pressure of flotation method (PFM) is described.The effective isothermal compressibility of a flotation liquid mixture of1,2,3-tribromopropane and 1,2-dibromoethane is obtained. Density comparisonmeasurements are presented for silicon spheres of mass 1 kg from the NationalResearch Laboratory of Metrology (NRLM) for the density standard and thedetermination of the Avogadro constant. The combined relative uncertainty ofPFM density comparison measurement for S4 and S5 NRLM silicon spheres is5×10-8. Adjusted densities are calculated from the comparison andabsolute measurements based on a least-squares analysis through a matrixformulation.
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