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%I #41 Jul 16 2023 22:38:18
%S 4,8,3,5,9,7,8,4,8,4,1,6,9,8,3,6,3,2,4,4,7,6,5,8,2,8,5,0,5,4,5,2,8,1,
%T 3,5,3,5,3,3,5,1,1,8,6,6,0,0,4,0,1,4,4,6,0,9,6,9,7,4,9,9,2,0,3,2,0,4,
%U 1,7,9,7,8,0,6,8,0,4,0,8,2,8,0,9,1,7,4,6,0,5,5,5,4,0,9,3,0,2,4,5
%N Decimal expansion of K_J = 2 e/h (Josephson constant) in units of A s^2 kg^{-1} m^{-2} in the 2019 SI system of units.
%C The value of K(J-90) is 483597.9 * 10^9 Hz V^-1 based on measurements in 1990. - _Ralf Steiner_, Jan 03 2019
%C The value of K(J) is 2 * e / h = 483597.848416... * 10^9 Hz V^-1 based on SI definitions (effective on May 20, 2019). - _Ralf Steiner_, Jan 03 2019
%C From _Wolfdieter Lang_, May 20 2019: (Start)
%C For the seven units of the 2019 SI system see A322415 with references.
%C Here only the Planck constant h = 6.62607015*10^{-34} J s, with J = kg m^2 s^(-2), and the elementary charge e = 1.602176634*10^{-19} C, with C = A s are used.
%C The 1990 definition of Volt with symbol V is K_{J-90} = (V s)^{-1}, where s^(-1) = Δν_{Cs}/9192631770. (End)
%H BIPM, <a href="https://www.bipm.org/en/committees/cg/cgpm/26-2018/resolution-1">On the revision of the International System of Units (SI)</a>, BIPM, Nov 13-16 2018.
%H NIST, <a href="https://physics.nist.gov/cgi-bin/cuu/Value?kjos">Josephson constant</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Josephson_effect">Josephson effect</a>
%F Equals 2 * A081823 / A003676.
%e K_J = 2*e/h = 4.83597848416983632447658285054528135353351186600401446096974992032041797... * 10^14 A s^2/(kg m^2). - _Wolfdieter Lang_, May 20 2019
%t RealDigits[2*(1.602176634`100*10^(-19))/(6.62607015`100*10^(-34))][[1]]
%o (PARI) 21362355120000000000000/44173801 \\ _Charles R Greathouse IV_, Jul 16 2023
%Y Cf. A003676 (h), A081823 (e), A248507 (inverse).
%K nonn,cons,easy
%O 15,1
%A _Arkadiusz Wesolowski_, Oct 07 2014
%E Updated by _Ralf Steiner_, Jan 03 2019
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