ERRATUM: Present state of the solid and liquid density standards
ERRATUM: Present state of the solid and liquid density standards
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勘误表：固体和液体密度标准的现状
DOI：
10.1088/0026-1394/41/2/s01
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发表时间：
2004
期刊：
影响因子：
2.4
通讯作者：
K. Fujii
中科院分区：
文献类型：
--
作者：
K. Fujii
综述了固体和液体密度的绝对测量方法和装置。国家计量院最近开发了一种基于单晶硅球的密度标准，将1 kg硅球的质量与可追溯到千克原型的质量标准进行比较，并通过光学干涉仪测量其直径直接确定体积，从而使密度单位可直接追溯到国际标准物质单位和长度。该密度测定的相对合成标准不确定度已降至1×10−7。详细介绍了该固体密度标准，以及用静液称重法、浮选压力法和磁悬浮法测量固体和液体的差示密度。简要总结了水和汞密度绝对测量的最新结果。
The method and devices used for the absolute measurement of the density of solids and liquids are reviewed. A density standard based on a single-crystal silicon sphere has recently been developed at national metrology institutes, where the mass of the 1 kg silicon sphere is compared with that of the mass standard traceable to the prototype of the kilogram, and the volume is determined directly by measuring its diameter using an optical interferometer, so that the unit of the density is directly traceable to the SI units of mass and length. The relative combined standard uncertainty for such a density determination has been reduced to 1 × 10−7. Details of this solid density standard, and differential density measurements of solids and liquids by hydrostatic weighing, pressure of flotation, and magnetic suspension methods are described. Recent results on the absolute measurements of the density of water and mercury are briefly summarized.