cp's OEIS Frontend

A003678 Decimal expansion of the SI unit c (speed of light in vacuum), c = 299792458 meters/second.

%I A003678 M1912 #100 Jan 26 2024 10:18:25
%S A003678 2,9,9,7,9,2,4,5,8
%N A003678 Decimal expansion of the SI unit c (speed of light in vacuum), c = 299792458 meters/second.
%C A003678 Since 1983, the speed of light has been defined to be exactly 299792458 m/s. - Ron Marcinski (ronmarcinski(AT)hotmail.com), Apr 18 2002
%C A003678 From _Stanislav Sykora_, Jun 16 2012: (Start)
%C A003678 General context: Within current metrological systems (SI + IAU definitions), several physics constants have been "assigned" immutable values. They thus became metrological reference points, no longer subject to experimental assessment. These should not be confused with "conventional" values of some empirical quantities (such as Josephson's constant) used in applied metrology, but not assigned, and therefore subject to possible future revisions.
%C A003678 Assigned metrological constants [before the inception of the 2019 SI, which introduced some changes, see below for references] and some of their combinations that appear in the OEIS include the speed of light (this sequence); magnetic permeability of vacuum (A019694); electric permittivity of vacuum (A081799); characteristic impedance of vacuum (A213610); standard gravity acceleration (A072915), standard atmosphere (A213611), Julian year (A213612), Gregorian year (A213613) and the light-year (A213614), all in basic SI units.
%C A003678 (End)
%C A003678 Prime factors of this number are 2^1, 7^1, 73^1, 293339^1. - _John W. Nicholson_, Jun 15 2014
%C A003678 c is also the speed of gravity. - _Omar E. Pol_, Jun 23 2017
%C A003678 In the 2019 SI system of units (see the second BIPM link, and A322415) one of the seven defining constants is c = 299792458 m/s. - _Wolfdieter Lang_, Feb 12 2019 [corrected by _Ivan Panchenko_, May 20 2019]
%D A003678 CRC Handbook for Chemistry and Physics, 75th edition, (1994-1995), Page 1-1.
%D A003678 H. J. Fischbeck and K. Fischbeck, Formulas. Facts and Constants, Springer-Verlag, NY, 2nd ed., 1987.
%D A003678 R. F. Fox and T. P. Hill, An exact value for Avogadro's number, American Scientist, 95 (No. 2, 2007), 104-107.
%D A003678 K. R. Lang, Astrophysical Data: Planets and Stars, Springer-Verlag, NY, 1991.
%D A003678 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A003678 BIPM, <a href="https://www.bipm.org/">Bureau International des Poids et Mesures</a>, the historic home of SI units (works jointly with NIST).
%H A003678 BIPM, <a href="https://doi.org/10.59161/CGPM2018RES1E">On the revision of the International System of Units (SI)</a>, BIPM, Nov 13-16 2018.
%H A003678 G. Bonnet, <a href="http://culturesciencesphysique.ens-lyon.fr/Entree_par_theme/generalites/VLumiere">La vitesse de la lumiere (Text in French)</a> [broken link].
%H A003678 IAU, <a href="http://www.iau.org/">International Astronomical Union</a> has accepted SI and added a few definitions of its own.
%H A003678 P. J. Mohr, B. N. Taylor and D. B. Newell, <a href="http://dx.doi.org/10.1103/RevModPhys.80.633">CODATA recommended values of the fundamental physical constants: 2006, Rev.Mod.Phys. 80, 2008, 633-730. DOI: 10.1103/RevModPhys.80.633</a>. (This is the hard-core source of what became CODATA 2010.)
%H A003678 NIST, <a href="http://physics.nist.gov/cgi-bin/cuu/Value?c">speed of light in vacuum</a>.
%H A003678 S. Sykora, <a href="http://www.ebyte.it/library/educards/constants/ConstantsOfPhysicsAndMath.html">Constants of Physics and Mathematics</a>, extensive constant-at-a-glance tables.
%H A003678 Eric Weisstein, World of Physics, <a href="http://scienceworld.wolfram.com/physics/SpeedofLight.html">Speed of Light</a>.
%H A003678 Wikipedia, <a href="http://en.wikipedia.org/wiki/Speed_of_gravity">Speed of gravity</a>.
%H A003678 Wikipedia, <a href="http://en.wikipedia.org/wiki/Speed_of_light">Speed of light</a>.
%H A003678 Wikipedia, <a href="https://en.wikipedia.org/wiki/2019_redefinition_of_SI_base_units">2019 redefinition of SI base units</a>
%F A003678 c = 299792458 m/s (equals 299792.458 km/s).
%t A003678 IntegerDigits[299792458] (* _Michael De Vlieger_, Jun 23 2017 *)
%Y A003678 Cf. A224236, A224237, A224238, A070058, A070059, A070060, A070062, A070063, A070064, A322415.
%Y A003678 More assigned constants: A003676 (h), A230458 (Δν_{Cs}), A081823 (e), A322578 (N_A), A070063 (k), A021687 (1/K_{cd}); A182999 (c^2), A183000 (c^3), A183001 (c^4), A019694, A081799, A213610, A072915, A213611, A213612, A213613, A213614.
%K A003678 cons,nonn,fini,full
%O A003678 9,1
%A A003678 _N. J. A. Sloane_