mm NI8T PUBLICATIONS pkyiiCitl Ccyi^^^^ts/Values -f^^ yh.krc^py^^ P.J. T^y/oy^ U.57 . i b02CODATARECOMMENDEDVALUESOFTHEFUNDAMENTAL ONSTANTSOFPHYSICSANDCHEMISTRY nistsp959 (Apr/2005) duesfrom: P. .1. MolirandB. N,Taylor. Rev. Mod. Phys. 77, 1 (2005). Thenumber parenthesisistheone-.sigma(1a)uncertaintyinthelasttwodigitsofthegivenvalue. Quantity Symbol Numerical value Unit cedoflight invacuum C.Co 299792458 (exact) mcs-i rigncticconstant 471X 10"' (exact) NA"^ i..''cwtrtiocnicaonnsctoannsttaln/t(/io(fiCg^r)avitation G 8d..d875442(118(7)8j1X7.1.0. x 10*'^ IFPm-I' '[anckconstant h O.D<iDUD9o(ll) X 10 " Js lU{'2n) n l.uoh0iIooyio) X iu JS ll-iiientarycharge e 1.60217653(14) x 10"'^ c jic-structureconstante^/(47Ce(ific} a 7.297352568(24) x 10^^ . iwrsefine-structureconstant a-' 137.03599911(46} '.dhergconstanta'm^c/{2h) 10973731.568525(73) ij'hrradiusa/(47li?x) Co 0.5291772108(18) x lO^i" m ;Uirmagneton eh/(27nf.) MB 927.400949(80) x lO'^^ JT-' Quantity Symbol Numerical \'aluc Unit electronmass /7i,, 9.109:i«2()(l(i) X lO '" kg protonmass mp 1.67262171(29) x 10'^' kg proton-electronmassratio 1836.15267261(85) Avogadroconstant Na,L 6.0221415(10) X 10^^ mol"^ FaradayconstantN/^e F 96485.:3383(83) Cmol-' molargasconstant R 8.314472(15) .1mol-' K Boitziiiannconstant R/Na k 1.3806.505(24) x lO"*' J K-' Stelan-Boltzmannconst. K'k'^/{60h'^c- 5.670400(40) x 10"* Wm - K raagneticfluxquantumh/{2e) ) 2.06783372(18) x lO"''' Wb Josephsonconstant2e/h Ks 483597.879(41) x 10" HzV-' vonKlitzingconstanth/e- Rk 25812.807449(86) n electronvolt (e/C) J eV 1.602176.53(14) x 10 " .] (unified) atomicmassunit j^m{^~C) u 1.660.53886(28) x 10^^' kg A moreextensive listingofconstants isavailable in thereferencegiven aboveand m tlie NISTPhysicsLaborator\'Website physicsnistgov/constants, 11^^^^^ NationalInstituteofStandardsandTechnology I ^f^BMi^l TechnologyAdministration,U.S.DeporlmenlofCommerce I I i