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Changes Coming to the International System of Units
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).
The Committee on Data for Science and Technology (CODATA), www.codata.org/
5.Barry N. Taylor, “The current SI seen from the perspective of the proposed new SI,” J. Res. NIST 116, 798–807 (2011).
6.M. Stock, “The watt balance: Determination of the Planck constant and redefinition of the kilogram,” Phil. Trans. R. Soc. A 369, 3936–3953 (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, 2378–2386 (2011).
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.
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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.
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