{"pid":"https://si-digital-framework.org/SI/units/metre","unitId":"metre","label":"metre","symbol":"m","startValidity":"1960-10-14","endValidity":"1983-10-16","unitType":"SI base unit","unitTypeId":"https://si-digital-framework.org/SI#SIBaseUnit","unitDefinitionLabel":"metre1960","unitDefinitionId":"https://si-digital-framework.org/SI#metre1960","definition":"The metre is the length equal to $1\\,650\\,763.73$ wavelengths in vacuum of the radiation corresponding to the transition between the levels $2\\rm{p}^{10}$ and $5\\rm{d}^{5}$ of the krypton 86 atom.","definingResolution":"CGPM11-Res6","eventName":"11th meeting of the CGPM","eventDate":"1960-10-20","resolutionLink":"https://doi.org/10.59161/cgpm1960res6e","unitDefinitionStatus":"superseded","previousVersionDate":"1960-10-13","hasPreviousDefinition":true,"previousDefinition":"https://si-digital-framework.org/SI#metre1927","nextDefinition":"https://si-digital-framework.org/SI#metre1983","resNbr":"6","resolutionBody":"CGPM","resolutionType":"Resolution","prefixRestriction":false,"unitQuantities":[{"code":"LENG","label":"length"}],"notes":["The old international prototype of the metre which was sanctioned by the 1st CGPM in 1889 is still kept at the BIPM under the conditions specified in 1889."],"notesIds":["https://si-digital-framework.org/SI#metre1960note1"],"nextVersionDate":"1983-10-17"}