References & Sources  -  September 26, 1998

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A step closer to an atomic-based kilogram?

A new, ultraprecise measurement of the Planck constant represents an important step toward redefining the global standard for the kilogram.

 

References:

Williams, E.R., et al. 1998. Accurate measurement of the Planck constant. Physical Review Letters 81(Sept. 21):2404.

 

Further Readings:

Lipkin, R. 1995. Bearing down on the kilogram standard. Science News 147(Jan. 28):63.

Peterson, I. 1994. Putting atoms in the balance, one by one. Science News 146(Sept. 24):199.

______. 1993. Tidying up the kilogram. Science News 143(April 24):264.

 

Sources:

Erich Braun
Physikalisch-Technische Bundesanstalt
Q.1 "Physikalische Grundlagen"
Postfach 33 45
D-38023 Braunschweig
Germany

Edwin R. Williams
National Institute of Standards and Technology
Gaithersburg, MD 20899

From Science News, Vol. 154, No. 13, September 26, 1998, p. 199.
Copyright Ó 1998 by Science Service.

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