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%I #11 Mar 13 2021 23:44:59
%S 1,7,8,2,6,6,1,9,2,1,6,2,7,8,9,7,7,0,3,1,8,1,0,4,0,7,6,1,8,9,3,3,6,2,
%T 9,6,9,9,5,2,1,2,4,5,6,4,9,1,2,9,2,0,7,7,4,3,9,8,9,5,9,7,4,5,9,6,5,8,
%U 6,5,3,1,3,2,3,7,0,9,5,5,8,5,7,1,5,5,3,7,8,4,1,4,7,2,8,4,1,7,8,0
%N Decimal expansion of number of kilograms (kg) in the mass equivalent of 1 electronvolt (eV/c^2).
%C A widely-used unit of mass in particle physics.
%C Since 1 eV/c^2 is too small, MeV/c^2 and GeV/c^2 are more common.
%C Period 395732340201618.
%H Wikipedia, <a href="https://en.m.wikipedia.org/wiki/Electronvolt">Electronvolt</a>
%F Equals A081823 / A003678^2.
%e 1 eV/c^2 = (1.602176634 * 10^(-19))/299792458^2 kg = 1.7826619... * 10^(-36) kg, an order of magnitude larger than the total mass of the three neutrinos;
%e 1 MeV/c^2 = 1.7826619... * 10^(-30) kg, about 1.96 times of the mass of an electron;
%e 1 GeV/c^2 = 1.7826619... * 10^(-27) kg, about 1.07 times of the mass of a proton.
%o (PARI) default(realprecision, 100); (1.602176634 * 10^-19) / 299792458^2
%Y Conversions between units:
%Y A081823 (electronvolt to joule);
%Y A213611 (the standard atmosphere to pascal);
%Y A213612 (Julian year to second);
%Y A213613 (Gregorian year to second);
%Y A213614 (light-year to meter);
%Y A321218 (Torr to pascal);
%Y A321984 (ounce to kilogram);
%Y A342484 (pound-force to newton);
%Y this sequence (the mass equivalent of electronvolt to kilogram).
%K nonn,cons,easy
%O -35,2
%A _Jianing Song_, Mar 13 2021