Meter: Perbedaan antara revisi
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Pada tahun 1960, ketika [[laser]] diperkenalkan, [[Conférence Générale des Poids et Mesures|Konferensi Umum tentang Berat dan Ukuran]] (Conférence Générale des Poids et Mesures/CGPM) ke-11 mengganti definisi meter sebagai 1.650.763,73 kali panjang gelombang spektrum cahaya oranye-merah [[atom]] [[krypton]]-86 dalam sebuah ruang [[vakum]]. Pada tahun 1983, BIPM menetapkan meter sebagai jarak yang dilalui [[cahaya]] melalui vakum pada 1/299.792.458 detik (kecepatan cahaya ditetapkan sebesar 299.792.458 meter per detik). Oleh karena [[kecepatan cahaya]] dalam vakum adalah sama di manapun saja, definisi ini lebih universal dibandingkan dengan jarak ukurlilit [[bumi]] atau panjang batang logam tertentu. Oleh karena itu, jika batang logam itu hilang atau musnah, panjang meter standar masih dapat diulangi dalam laboratorium manapun. Selain itu ia secara teori dapat diukur dengan lebih tepat dibandingkan dengan ukuran yang lain.
== Referensi ==
* {{Anchor|cgpm1983}}17th [[General Conference on Weights and Measures]]. (1983). [http://www.bipm.org/en/CGPM/db/17/1/ Resolution 1.] [[International Bureau of Weights and Measures]].
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* {{Anchor|BarbrowJudson1976}}Barbrow, Louis E. & Judson, Lewis V. (1976). ''[http://www.nist.gov/pml/pubs/sp447/index.cfm Weights and Measures Standards of the United States: A brief history] (Special Publication 447).''. National Institute of Standards and Technology.
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* {{cite web |publisher=Bureau International des Poids et Mesures |year=2006 |url=http://www1.bipm.org/utils/common/pdf/si_brochure_8.pdf |format=PDF |title=The International System of Units (SI) |language=French |accessdate=18 August 2008 |ref=bipm2006}}
** [http://www.bipm.org/en/si/si_brochure/ HTML version]. Retrieved 24 August 2008.
* {{Anchor|BIPMResolutions}}Bureau International des Poids et Mesures. (n.d.). [http://www.bipm.fr/en/convention/resolutions.html ''Resolutions of the CGPM''] (search facility). Retrieved 3 June 2006.
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* {{Anchor|Mohr2007}}Mohr, P., Taylor, B.N., and David B. Newell, D. (28 December 2007). [http://physics.nist.gov/cuu/Constants/codata.pdf ''CODATA Recommended Values of the Fundamental Physical Constants: 2006'']. Gaithersburg, MD: National Institute of Standards and Technology. Retrieved 18 August 2008.{{dead link |date=July 2012}}
* {{Anchor|NIST2003}}National Institute of Standards and Technology. (December 2003). [http://physics.nist.gov/cuu/Units/index.html ''The NIST Reference on Constants, Units, and Uncertainty: International System of Units (SI)''] (web site):
** {{Anchor|NISTbaseunits}}[http://physics.nist.gov/cuu/Units/units.html ''SI base units'']. Retrieved 18 August 2008.
** {{Anchor|NISTbasedefinitions}}[http://physics.nist.gov/cuu/Units/current.html ''Definitions of the SI base units'']. Retrieved 18 August 2008.
** {{anchor|nistmetre}}[http://physics.nist.gov/cuu/Units/meter.html ''Historical context of the SI: Metre'']. Retrieved 26 May 2010.
* {{Anchor|NIST2011}}National Institute of Standards and Technology. (27 June 2011). ''[http://www.nist.gov/pml/div688/grp50/primary-frequency-standards.cfm NIST-F1 Cesium Fountain Atomic Clock]''. Author.
* {{Anchor|NPL2010}}National Physical Laboratory. (25 March 2010). ''[http://www.npl.co.uk/science-technology/time-frequency/optical-frequency-standards-and-metrology/research/iodine-stabilised-lasers Iodine-Stabilised Lasers]''. Author.
* {{Anchor|NRC2010}}National Research Council Canada. (5 February 2010). [http://www.nrc-cnrc.gc.ca/eng/projects/inms/si-length.html Maintaining the SI unit of length]. Retrieved 4 December 2010.
* {{Anchor|Naughtin2008}}Naughtin, Pat. (2008). ''[http://www.metricationmatters.com/docs/Spelling_metre_or_meter.pdf Spelling metre or meter.]'' Author.
* {{anchor|penzes2005}}Penzes, W. (29 December 2005). [http://www.nist.gov/pml/div681/museum-timeline.cfm ''Time Line for the Definition of the Meter'']. Gaithersburg, MD: National Institute of Standards and Technology{{spaced ndash}}Precision Engineering Division. Retrieved 4 December 2010.{{dead link |date=July 2012}}
* {{Anchor|taylor2008a}}Taylor, B.N. and Thompson, A. (Eds.). (2008a). [http://physics.nist.gov/Pubs/SP330/sp330.pdf ''The International System of Units (SI)'']. United States version of the English text of the eighth edition (2006) of the International Bureau of Weights and Measures publication ''Le Système International d’ Unités (SI)'' (Special Publication 330). Gaithersburg, MD: National Institute of Standards and Technology. Retrieved 18 August 2008.
* {{Anchor|taylor2008b}}Taylor, B.N. and Thompson, A. (2008b). [http://physics.nist.gov/cuu/pdf/sp811.pdf ''Guide for the Use of the International System of Units''] (Special Publication 811). Gaithersburg, MD: National Institute of Standards and Technology. Retrieved 23 August 2008.
* {{Anchor|Tibo2005}}Tibo Qorl. (2005) [http://histoire.du.metre.free.fr/en/ The History of the Meter] (Translated by Sibille Rouzaud). Retrieved 18 August 2008.
* {{Anchor|turner}}Turner, J. (Deputy Director of the National Institute of Standards and Technology). (16 May 2008).[http://ts.nist.gov/WeightsAndMeasures/Metric/upload/FRN_Vol_73_No_96_16May2008_SI_Interpretation.pdf "Interpretation of the International System of Units (the Metric System of Measurement) for the United States"]. ''Federal Register'' Vol. 73, No. 96, p.{{nbsp}}28432-3.{{failed verification |date=July 2012}}
* {{Anchor|Wilkins2007}}Wilkins, J. (c. 2007). [http://www.metricationmatters.com/docs/WilkinsTranslationLong.pdf An essay towards a real character, and a philosophical language].[Also available [http://www.metricationmatters.com/docs/WilkinsTranslationShort.pdf without images of original].] Metrication Matters. (Reprinted from title page and pp. 190–194 of original, 1668, London: Royal Society)
* {{Anchor|Zagar1999}}Zagar, B.G. (1999). [http://books.google.com/books?id=VXQdq0B3tnUC&pg=PT164#PPT160,M1 Laser interferometer displacement sensors] in J.G. Webster (ed.). ''The Measurement, Instrumentation, and Sensors Handbook.'' CRC Press. isbn=0-8493-8347-1.
*
== Bacaan lebih lanjut ==
* Alder, Ken. (2002). ''The Measure of All Things : The Seven-Year Odyssey and Hidden Error That Transformed the World.'' Free Press, New York ISBN 0-7432-1675-X
== Pranala luar ==
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{{Satuan SI}}
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