Accurate measurement of the Planck constant

被引：136

作者：

Williams, ER ^{[1
]}

Steiner, RL ^{[1
]}

Newell, DB ^{[1
]}

Olsen, PT ^{[1
]}

机构：

[1] NIST, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.81.2404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a moving coil watt balance, electric power measured in terms of the Josephson and quantum Hall effects is compared with mechanical power measured in terms of the meter, kilogram, and second. We find the Planck constant h = 6.62606891(58) x 10(-34) Js. The quoted standard uncertainty (1 standard deviation estimate) corresponds to (8.7 x 10(-8))h. Comparing this measurement to an earlier measurement places an upper limit of 2 x 10(-8)/yr on the drift rate of the SI unit of mass, the kilogram. [S0031-9007(98)07164-6].

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收藏

页码：2404 / 2407

页数：4

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