Skip to main content
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
1.Bruce Barrow, James R. Frysinger, Robert H. Bushneil, Nancy Bale, Dennis Brownridge, Rodney Conn, Anthony French, Uri Gat, Stan Jakuba, Bill Potts, Howard Ressel, John T. Scott, Ralph Showers, Barry N. Taylor, Ambler Thompson, Paul Trusten, Gerry Uttrachi, and Matthew Zotter, American National Standard for Metric Practice (Institute of Electrical and Electronics Engineers, Inc., New York, and ASTM International, West Conshohocken, PA, 2011), IEEE/ASTM SI-10.
2.Bureau International des Poids et Mesures, The International System of Units (SI), 8th ed. (BIPM, Sèvres, France, 2006).
3.The Committee on Data for Science and Technology (CODATA),
4.NIST Metrology division,
5.Barry N. Taylor, “The current SI seen from the perspective of the proposed new SI,” J. Res. NIST 116, 798807 (2011).
6.M. Stock, “The watt balance: Determination of the Planck constant and redefinition of the kilogram,” Phil. Trans. R. Soc. A 369, 39363953 (2011).
6.A. Picard, Michael P. Bradley, H. Fang, A. Kiss, E. de Mirandés, B. Parker, Stéphane Solve, and M. Stock, “The BIPM watt balance: Improvements and developments,” IEEE Trans. Instrum. Meas. 60, 23782386 (2011).
7.I. A. Robinson, “A simultaneous moving and weighing technique for a watt balance at room temperature,” Metrologia 49, 108112 (2012).
8.Draft Resolution A, “On the possible future revision of the International System of Units, the SI,” presented to the Convocation of the General Conference on Weights and Measures - 24th meeting, Oct. 17–21, 2011.
9.CGPM, “On the possible future revision of the International System of Units, the SI,” Resolution 1, adopted at the 24th meeting of the CGPM, Oct. 17–21, 2011.
10.Patrick Gill, “When should we change the definition of the second?” presentation at the Discussion meeting, The Royal Society, London, Jan. 24–25, 2011.
11.BIPM, “What is a mise en pratique?, last viewed on Feb. 5, 2012.
12.M. Gläser, M. Borys, D. Ratschko, and R. Schwartz, “Redefinition of the kilogram and the impact on its future dissemination,” Metrologia 47, 419428 (2010).
13.BIPM, “The ‘explicit-constant’ formulation,”, last viewed on Feb. 5, 2012.

Data & Media loading...


Article metrics loading...



The International System of Units (SI) is a coherent system based originally on measurements of properties of material objects. In more recent times, the adopted definitions depend on setting values of universal constants wherever possible. The last remaining humanmade material object on which a standard is based is a platinum-iridium kilogram located in Sèvres, France. The International Bureau of Weights and Measures is considering replacing this physical object as the standard and tying all base units to physical constants that are fixed. The reasons will be explicated in this paper.


Full text loading...


Access Key

  • FFree Content
  • OAOpen Access Content
  • SSubscribed Content
  • TFree Trial Content
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd