Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

The Kibble balance and the kilogram

Published

Author(s)

Stephan Schlamminger, Darine El Haddad

Abstract

Dr. Bryan Kibble invented the watt balance in 1975 to improve the realization of the unit for electrical current, the ampere. With the discovery of the Quantum Hall e ect in 1980 by Dr. Klaus von Klitzing and in conjunction with the previously predicted Josephson e ect, this mechanical apparatus could be used to measure the Planck constant h. Following a proposal by Quinn, Mills, Williams, Taylor, and Mohr, the Kibble balance can be used to realize the unit of mass, the kilogram, by xing the numerical value of Planck's constant. Since 2017, the watt balance is called Kibble balance to honor the inventor, who passed in 2016. This article explains the Kibble balance, its role in the rede nition, and attempts an outlook to the future.
Citation
Comptes Rendus Physique

Keywords

Kibble balance, revised SI, kilogram
Created March 25, 2019, Updated October 8, 2019