{"constants":[{"constantId":"AvogadroConstant","label":"Avogadro constant","shortLabel":"Avogadro","symbol":"${N_{\\rm{A}}}$","value":6.02214076E23,"valueStr":"6.022 140 76 x 10²³","unit":"https://si-digital-framework.org/SI/units/mole-1","strExpression":"mol^-1","pid":"https://si-digital-framework.org/constants/AvogadroConstant","resolutionLink":"https://doi.org/10.59161/cgpm2018res1e","resNbr":"1","resolutionType":"Resolution","eventName":"26th meeting of the CGPM","eventDate":"2018-11-16","updateDate":"2019-05-20"},{"constantId":"BoltzmannConstant","label":"Boltzmann constant","shortLabel":"Boltzmann","symbol":"${k}$","value":1.380649E-23,"valueStr":"1.380 649 x 10⁻²³","unit":"https://si-digital-framework.org/SI/units/joule.kelvin-1","strExpression":"J . K^-1","pid":"https://si-digital-framework.org/constants/BoltzmannConstant","resolutionLink":"https://doi.org/10.59161/cgpm2018res1e","resNbr":"1","resolutionType":"Resolution","eventName":"26th meeting of the CGPM","eventDate":"2018-11-16","updateDate":"2019-05-20"},{"constantId":"PlanckConstant","label":"Planck constant","shortLabel":"Planck","symbol":"${h}$","value":6.62607015E-34,"valueStr":"6.626 070 15 x 10⁻³⁴","unit":"https://si-digital-framework.org/SI/units/joule.second","strExpression":"J . s","pid":"https://si-digital-framework.org/constants/PlanckConstant","resolutionLink":"https://doi.org/10.59161/cgpm2018res1e","resNbr":"1","resolutionType":"Resolution","eventName":"26th meeting of the CGPM","eventDate":"2018-11-16","updateDate":"2019-05-20"},{"constantId":"ElementaryCharge","label":"elementary charge","shortLabel":"ElementaryCharge","symbol":"${e}$","value":1.602176634E-19,"valueStr":"1.602 176 634 x 10⁻¹⁹","unit":"https://si-digital-framework.org/SI/units/coulomb","strExpression":"C","pid":"https://si-digital-framework.org/constants/ElementaryCharge","resolutionLink":"https://doi.org/10.59161/cgpm2018res1e","resNbr":"1","resolutionType":"Resolution","eventName":"26th meeting of the CGPM","eventDate":"2018-11-16","updateDate":"2019-05-20"},{"constantId":"HyperfineTransitionFrequencyOfCs-133","label":"hyperfine transition frequency of Cs-133","shortLabel":"HyperfineSplitting","symbol":"$\\Delta\\nu_{\\rm{Cs}}$","value":9.19263177E9,"valueStr":"9 192 631 770","unit":"https://si-digital-framework.org/SI/units/hertz","strExpression":"Hz","pid":"https://si-digital-framework.org/constants/HyperfineTransitionFrequencyOfCs-133","resolutionLink":"https://doi.org/10.59161/cgpm1967res1e","resNbr":"1","resolutionType":"Resolution","eventName":"13th meeting of the CGPM","eventDate":"1967-10-16","updateDate":"1967-10-13"},{"constantId":"LuminousEfficacy","label":"luminous efficacy","shortLabel":"LuminousEfficacy","symbol":"${K_{\\rm{cd}}}$","value":683.0,"valueStr":"683","unit":"https://si-digital-framework.org/SI/units/lumen.watt-1","strExpression":"lm . W^-1","pid":"https://si-digital-framework.org/constants/LuminousEfficacy","resolutionLink":"https://doi.org/10.59161/cgpm1979res3e","resNbr":"3","resolutionType":"Resolution","eventName":"16th meeting of the CGPM","eventDate":"1979-10-12","updateDate":"1979-10-11"},{"constantId":"SpeedOfLight","label":"speed of light","shortLabel":"SpeedOfLight","symbol":"$c$","value":2.99792458E8,"valueStr":"299 792 458","unit":"https://si-digital-framework.org/SI/units/metre.second-1","strExpression":"m . s^-1","pid":"https://si-digital-framework.org/constants/SpeedOfLight","resolutionLink":"https://doi.org/10.59161/cgpm1975res2e","resNbr":"2","resolutionType":"Resolution","eventName":"15th meeting of the CGPM","eventDate":"1975-06-03","updateDate":"1975-06-03"}]}