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Diferencia entre revisiones de «Conferencia General de Pesas y Medidas»

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m Revertidos los cambios de 186.2.138.213 (disc.) (HG) (3.1.22)
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Línea 7:
En 1960, en la undécima CGPM, el sistema de medidas, primero conocido como [[Sistema métrico decimal]] y más tarde su ampliación, conocido como [[Sistema MKS de unidades|sistema MKS]], fue llamado oficialmente [[Sistema Internacional de Unidades]].
 
soy pro DONAL TROMP IS GAY!
== Reuniones de la CGPM y decisiones importantes ==
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{| width="100%"
|width="11%" valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=1 1º] ([[1889]])
|width="90%" |Se definió al [[kilogramo]] como la masa del kilogramo patrón internacional construido en [[platino]]-[[iridio]], que se encuentra en la [[Oficina Internacional de Pesas y Medidas]] (Bureau international des poids et mesures), [[Sèvres]], Francia. Se adoptó además el metro patrón internacional. Se adoptó el [[quilate]], equivalente a 200 mg.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=5 5º] ([[1913]])
|Se propuso la escala internacional de temperatura.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=6 6º] ([[1921]])
|Se revisó la [[Convención del Metro|convención del metro]].
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=7 7º] ([[1927]])
|Se creó el Comité Consultivo sobre electricidad (CCE).
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=8 8º] ([[1933]])
|Se reconoció la necesidad de contar con una unidad eléctrica absoluta.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=9 9º] ([[1948]])
|Se definieron el [[amperio|ampere]], el [[bar (unidad de presión)|bar]], el [[culombio|coulomb]], el [[faradio|farad]], el [[henrio|henry]], el [[joule (unidad)|juole]], el [[newton (unidad)|newton]], el [[ohmio|ohm]], el [[voltio|volt]], el [[vatio|watt]] y el [[weber (unidad)|weber]]. Se eligió el [[grado Celsius]] de entre las tres designaciones en uso por aquella época. La l (L minúscula) <!--symbols for units of measure never italic-->fue adoptada como símbolo del litro. Se aceptaron tanto la coma como el punto, como indicadores de cifras decimales. Se modificaron los símbolos del [[estéreo (unidad)|estéreo]] y del [[segundo]].<ref>{{cita web |url=http://www.bipm.org/jsp/en/ViewCGPMResolution.jsp?CGPM=9&RES=7 |urltrad= |título=Resolution 7 of the 9th meeting of the CGPM (1948) |fechaacceso=2 de marzo de 2009 |idioma=inglés }}</ref> Se propuso, pero no fue adoptado, el regreso al sistema numérico de la [[Escalas numéricas larga y corta|Escala numérica larga]].
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=10 10º] ([[1954]])
|Se definieron el [[kelvin]], y la [[Atmósfera (unidad)|atmósfera normalizada]]. Se comenzó a gestar lo que sería el ''Sistema Internacional de Unidades'' ([[metro]], [[kilogramo]], [[segundo]], [[ampere]], [[kelvin]], [[candela]]).
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=11 11º] ([[1960]])
|Se redefinió el metro en función de la longitud de onda de la luz. Se adoptaron las siguientes unidades: [[Hercio|hertz]], [[lumen]], [[lux]], [[tesla (unidad)|tesla]]. Se le dio al nuevo sistema métrico el símbolo oficial de '''SI''' por ''Système International d'Unités''; el modernizado "sistema métrico internacional". Se confirmaron los prefijos ''[[pico (prefijo)|pico]]'', ''[[nano (prefijo)|nano]]'', ''[[micro (prefijo)|micro]]'', ''[[Mega (prefijo)|mega]]'', ''[[giga]]'' y ''[[tera (prefijo)|tera]]''.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=12 12º] ([[1964]])
|Se repuso la definición original de [[litro]] = 1 dm³ como unidad aceptada por el SI. Se fijaron los prefijos ''[[atto]]'' y ''[[femto]]''.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=13 13º] ([[1967]])
|Se redefinió el segundo como la duración de 9&nbsp;192&nbsp;631&nbsp;770 períodos de la radiación correspondiente a la transición entre dos niveles hiperfinos del estado fundamental del átomo de [[cesio]]-133 a una temperatura de 0 K. El ''grado Kelvin'' fue renombrado ''kelvin''. Se redefinió la [[candela]].
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=14 14º] ([[1971]])
|Se definió la nueva [[Unidades básicas del Sistema Internacional|unidad fundamental]] [[mol]]. Se aprobaron el [[Pascal (unidad)|pascal]] y el [[Siemens (unidad)|siemens]].
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=15 15º] ([[1975]])
|Se adoptaron los prefijos ''[[peta (prefijo)|peta]]'' y ''[[exa]]''. Adopción de las unidades radiológicas [[gray (unidad radiación)|gray]] y [[becquerel]].
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=16 16º] ([[1979]])
|Se definieron la [[candela]] y el [[sievert]]. Se permitió el uso de los símbolos l y L <!--symbols for units of measure never italic--> en forma provisional para referirse al litro.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=17 17º] ([[1983]])
|Se redefinió el [[metro]] en función de la rapidez de la luz, manteniendo inalterada su longitud.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=18 18º] ([[1987]])
|Se adoptaron valores convencionales para la [[constante Josephson]], ''K<sub>J</sub>'', y [[constante von Klitzing]], ''R<sub>K</sub>'', en preparación para definiciones alternativas del ampere y el kilogramo.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=19 19º] ([[1991]])
|Se definieron los prefijos ''[[yocto]]'', ''[[zepto]]'', ''[[zetta]]'' y ''[[yotta]]''.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=20 20º] ([[1995]])
|Las unidades suplementarias del SI ([[radián]] y [[estereorradián]]) se clasificaron como [[Unidades derivadas del Sistema Internacional|''unidades derivadas'']].
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=21 21º] ([[1999]])
|Se adoptó una nueva unidad derivada del SI, el [[katal]] (equivalente a un [[mol]] por [[segundo]]), para la expresión de la actividad catalítica.
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=22 22º] ([[2003]])
|Se reafirma la validez de la coma o el punto como elementos para indicar cifras decimales, y no como símbolos de agrupamiento para facilitar la lectura; "los números pueden agruparse de a tres para facilitar la lectura; pero no se deben utilizar ni comas ni puntos en los espacios entre grupos".<ref>{{cita web |url=http://www.bipm.org/jsp/en/ViewCGPMResolution.jsp?CGPM=22&RES=10 |urltrad= |título=Resolution 10 of the 22nd meeting of the CGPM (2003) |fechaacceso=2 de marzo de 2009 |idioma=inglés }}</ref>
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=23 23º] ([[2007]])
|Se emite una aclaración sobre el [[kelvin]] y comentarios sobre posibles revisiones de algunas unidades base.
|-
| valign="top" |[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=24 24ª] ([[2011]])
|Propuesta de [[Redefinición de las unidades del SI|revisión de las definiciones de unidades del SI]], incluyendo redefinir el [[kilogramo]] en relación con la [[constante de Planck]] como asunto principal, a reserva de ciertos criterios técnicos encontrados.<!-- including redefining the kilogram in relation to the [[Planck constant]] were accepted in principal subject to certain technical criteria having been met. -->
|-
| valign="top"|[http://www.bipm.org/jsp/en/ListCGPMResolution.jsp?CGPM=25 25º] ([[2014]])
|Reafirma su intención de redefinir las unidades del SI, incluyendo el [[kilogramo]], el [[amperio|ampere]], el [[kelvin]], y el [[mol]].
|}
 
== Referencias ==
Obtenido de «https://es.wikipedia.org/wiki/Conferencia_General_de_Pesas_y_Medidas»