Quantum redactiones paginae "Metrum" differant

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{{alius|longitudine|Metrum (discretiva)}}
[[Fasciculus:Platinum-Iridium meter bar.jpg|right|frame|''Metrum ordiale,'' Platinum-Iridium. Definitio metri usque ad annum [[1960]].]]
'''Metrum''' {{victio|metrum|i|n}} ([[Lingua Graeca|Graece]]: ''μέτρον,'' via [[Francogallice]] ''mètre'') est [[mensura principalis]] ([[Anglice]]: ''base unit'') [[longitudo|longitudinis]], una ex septem principalibus [[physica]]e mensuris in [[Internationale Unitarum Systema|Internationali Unitarum Systemate]] ([[Anglice]]: ''International System of Units''). Definitio, primum excogitatum ut 10&thinsp;000&thinsp;00010 000 000 pars spatii ab [[aequator]]e ad [[Polus Septentrionalis|Polum Septentrionalem]], continenter expolitur ut auctum [[metrologia]]e scitae implicet. Post [[1983]], metrum definitur ut spatium a [[lux|luce]] in [[vacuum|vacuo]] transitum 299&thinsp;792&thinsp;458299 792 458 parte [[secundum|secundi]].<ref name="Res1">17th General Conference on Weights and Measures (1983), decretum primum.</ref>
 
== Definitio ==
=== Vetus ===
Anno [[1793]] metrum primum definitum fit. Definitio erat metrum esse partem <math>1/40000000</math> meridiani orbis, qui [[Lutetia]]m percurrit. Anno [[1795]] primum exemplar in metallo orichalco factum et anno [[1799]] exemplar finale, quod "metrum ordiale" nominatur, in metallo [[platinum|platino]] funditum est.
 
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Ab anno [[1960]] usque ad annum [[1983]] metrum erat pars producti <math>1650763,73</math> longitudinis undae in vacuo quae atomus Cryptonis-86 inter affectiones 5d5 et 2p10 mutans generat.
 
=== Hodierna ===
Ab anno [[1983]], metrum definitur ut spatium quod [[lux|lumen]] in vacuo in parte <math>1/299792458</math> [[secundus|secundi]] percurrit, ut [[celeritas lucis|velocitas lucis]] subtiliter definita sit sequenti modo
:<math> c = 299792458 \;\mathrm{m}/\mathrm{s}</math>
 
== Variae Longitudines ==
: [[chiliometrum]] = 1000 metrorum
: [[decimetrum]] = 1/10 metri
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: [[femtometrum]] = 10<sup>-15</sup> metri
 
== Vide etiam ==
* [[Index magnitudinum physicarum]]
* [[Spatium]]
 
== Notae ==
<references/>
 
== Bibliographia ==
* {{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]].
* {{Anchor|beers1992}}Beers, J.S. & Penzes, W. B. (1992). [http://ts.nist.gov/MeasurementServices/Calibrations/upload/4998.pdf NIST Length Scale Interferometer Measurement Assurance.] (NISTIR 4998). [[National Institute of Standards and Technology]].
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* 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.
* 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=0849383471.
 
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