{"pid":"https://si-digital-framework.org/SI/units/metre","unitId":"metre","label":"metre","symbol":"m","startValidity":"1983-10-17","endValidity":"2019-05-19","unitType":"SI base unit","unitTypeId":"https://si-digital-framework.org/SI#SIBaseUnit","unitDefinitionLabel":"metre1983","unitDefinitionId":"https://si-digital-framework.org/SI#metre1983","definition":"The metre is the length of the path travelled by light in vacuum during a time interval of ${1/299\\:792\\:458}$ of a second.","definingResolution":"CGPM17-Res1","eventName":"17th meeting of the CGPM","eventDate":"1983-10-21","resolutionLink":"https://doi.org/10.59161/cgpm1983res1e","unitDefinitionStatus":"superseded","previousVersionDate":"1983-10-16","hasPreviousDefinition":true,"previousDefinition":"https://si-digital-framework.org/SI#metre1960","nextDefinition":"https://si-digital-framework.org/SI#metre2018","resNbr":"1","resolutionBody":"CGPM","resolutionType":"Resolution","cstLabel":"speed of light","cstHidden":"SpeedOfLight","constant":"speed of light","constantPid":"https://si-digital-framework.org/constants/SpeedOfLight","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#metre1983note1"],"nextVersionDate":"2019-05-20"}