Search: a003676 -id:a003676
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A003678
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Decimal expansion of the SI unit c (speed of light in vacuum), c = 299792458 meters/second.
(Formerly M1912)
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76
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OFFSET
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9,1
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COMMENTS
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Since 1983, the speed of light has been defined to be exactly 299792458 m/s. - Ron Marcinski (ronmarcinski(AT)hotmail.com), Apr 18 2002
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.
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.
(End)
Prime factors of this number are 2^1, 7^1, 73^1, 293339^1. - John W. Nicholson, Jun 15 2014
c is also the speed of gravity. - Omar E. Pol, Jun 23 2017
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]
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REFERENCES
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CRC Handbook for Chemistry and Physics, 75th edition, (1994-1995), Page 1-1.
H. J. Fischbeck and K. Fischbeck, Formulas. Facts and Constants, Springer-Verlag, NY, 2nd ed., 1987.
R. F. Fox and T. P. Hill, An exact value for Avogadro's number, American Scientist, 95 (No. 2, 2007), 104-107.
K. R. Lang, Astrophysical Data: Planets and Stars, Springer-Verlag, NY, 1991.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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c = 299792458 m/s (equals 299792.458 km/s).
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MATHEMATICA
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CROSSREFS
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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.
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KEYWORD
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AUTHOR
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STATUS
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approved
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A070058
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Decimal expansion of Newton's gravitational constant in SI units.
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29
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OFFSET
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-10,1
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COMMENTS
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Also called "Newtonian constant of gravitation".
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REFERENCES
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CRC Handbook of Chemistry and Physics, 75th edition, (1994-1995) Page 1-1
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LINKS
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FORMULA
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EXAMPLE
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6.674 30(15) * 10^(-11) m^3 kg^(-1) s^(-2) according to CODATA 2018 (digits in parentheses represent standard uncertainty).
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CROSSREFS
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KEYWORD
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AUTHOR
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Ron Marcinski (ronmarcinski(AT)hotmail.com), Apr 18 2002
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EXTENSIONS
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Updated by Omar E. Pol, Sep 01 2009, Sep 01 2012, Nov 14 2016
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STATUS
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approved
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A070063
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Decimal expansion of the Boltzmann constant k in the 2019 SI system in units J/K.
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23
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OFFSET
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-22,2
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COMMENTS
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The exact Boltzmann constant is one of the seven units in the 2019 system of units. See the BIMP link with the CGPM resolutuions from November 2018 which will become effective May 20 2019. See also A322415. - Wolfdieter Lang, Feb 12 2019
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REFERENCES
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CRC Handbook for Chemistry and Physics, 75th edition, (1994-1995), Page 1-1.
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LINKS
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BIPM, CGPM-2018 [See the link ``Resolutions of the CGPM" there.]
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FORMULA
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k = 1.380649×10^{-23} J/K. Joule J = kg m^2 s^(-2).
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CROSSREFS
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KEYWORD
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AUTHOR
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Ron Marcinski (ronmarcinski(AT)hotmail.com), Apr 18 2002
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EXTENSIONS
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Updated to conform with CODATA 2010 value by Ivan Panchenko, Jan 27 2015
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STATUS
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approved
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A078300
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Decimal expansion of Planck length.
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+0
6
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OFFSET
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-34,2
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LINKS
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EXAMPLE
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Planck length = 1.6162... * 10^(-35) meters.
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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a(-38) corrected and a(-39) and a(-40) added by Omar E. Pol, Jan 05 2011
Updated to conform with CODATA 2010 recommended value by Raphie Frank, Dec 16 2012
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STATUS
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approved
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A078301
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Decimal expansion of Planck mass.
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6
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OFFSET
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-7,1
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COMMENTS
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The estimate is subject to further revision in the future as it is dependent upon the value of G, the gravitational constant.
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LINKS
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EXAMPLE
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Planck mass = 2.176 434(24) * 10^(-8) kilograms.
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Updated sequence to reflect most current data as of December 2012 by Raphie Frank, Dec 13 2012
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STATUS
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approved
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A078302
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Decimal expansion of Planck time (in seconds).
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+0
7
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OFFSET
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-43,1
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COMMENTS
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This value is subject to further revision in the future as it is dependent upon the value of G, the gravitational constant, and h, Planck's constant.
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LINKS
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EXAMPLE
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Planck time = 5.391247(60) * 10^-44 second.
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Updated to conform with CODATA 2010 recommended value by Raphie Frank, Dec 16 2012
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STATUS
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approved
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A081799
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Decimal expansion of the electric permittivity of vacuum in SI units as defined before 20 May 2019.
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16
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8, 8, 5, 4, 1, 8, 7, 8, 1, 7, 6, 2, 0, 3, 8, 9, 8, 5, 0, 5, 3, 6, 5, 6, 3, 0, 3, 1, 7, 1, 0, 7, 5, 0, 2, 6, 0, 6, 0, 8, 3, 7, 0, 1, 6, 6, 5, 9, 9, 4, 4, 9, 8, 0, 8, 1, 0, 2, 4, 1, 7, 1, 5, 2, 4, 0, 5, 3, 9, 5, 0, 9, 5, 4, 5, 9, 9, 8, 2, 1, 1, 4, 2, 8, 5, 2, 8, 9, 1, 6, 0, 7, 1, 8, 2, 0, 0, 8, 9, 3, 2, 8, 6, 7
(list;
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OFFSET
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-11,1
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COMMENTS
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Denoted epsilon_0, this is a function of assigned metrological constants. Regarding these, see A003678 for general context notes, references and links. - Stanislav Sykora, Jun 16 2012
Also called electric constant. - Omar E. Pol, Oct 17 2013
The new value as defined after 20 May 2019 is (8.8541878128 +- 0.0000000013) * 10^(-12) F/m. - Jianing Song, Mar 13 2021
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LINKS
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FORMULA
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Explicitely: 1/([magnetic_permeability of vacuum]*[speed_of_light in vacuum]^2). - Stanislav Sykora, Jun 16 2012
Also 625000/(22468879468420441*Pi). - Omar E. Pol, Oct 17 2013
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EXAMPLE
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8.854187817...*10^-12 F m^-1.
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MAPLE
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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A081819
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Decimal expansion of Wien wavelength displacement law constant.
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+0
2
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2, 8, 9, 7, 7, 7, 1, 9, 5, 5, 1, 8, 5, 1, 7, 2, 6, 6, 1, 4, 7, 8, 6, 0, 5, 4, 4, 8, 0, 9, 2, 8, 8, 4, 7, 2, 6, 8, 0, 1, 6, 2, 8, 3, 0, 3, 0, 7, 1, 8, 5, 4, 4, 4, 0, 6, 3, 0, 7, 7, 4, 0, 1, 4, 0, 1, 5, 9, 1, 0, 6, 5, 6, 7, 6, 0, 7, 1, 3, 0, 5, 8, 5, 4, 6, 4, 1
(list;
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OFFSET
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-2,1
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LINKS
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FORMULA
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b = 2.89777...*10^-3 m K
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KEYWORD
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EXTENSIONS
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Updated to the exact value according to the 2019 SI redefinition by Andrey Zabolotskiy, Aug 25 2020
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STATUS
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approved
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A081820
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Decimal expansion of the Stefan-Boltzmann constant sigma in the 2019 SI system in units Watt/(m^2*K^4).
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0
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5, 6, 7, 0, 3, 7, 4, 4, 1, 9, 1, 8, 4, 4, 2, 9, 4, 5, 3, 9, 7, 0, 9, 9, 6, 7, 3, 1, 8, 8, 9, 2, 3, 0, 8, 7, 5, 8, 4, 0, 1, 2, 2, 9, 7, 0, 2, 9, 1, 3, 0, 3, 6, 8, 2, 4, 0, 5, 4, 6, 1, 7, 3, 7, 0, 5, 3, 9, 4, 8, 1, 6, 0, 6, 2, 6, 5, 2, 3, 3, 2, 6, 0, 8, 2, 5, 7, 1, 8, 5, 7, 7, 7, 0, 4, 4, 6, 8, 8, 7, 0, 3
(list;
constant;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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-7,1
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COMMENTS
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The Stefan-Boltzmann law states that for a black body with temperature T, its radiant emittance j* (power radiated per unit area) is sigma * T^4.
In SI units, all the values in the defining relation in the Formula section are fixed as of May 20 2019 (see the BIPM link), so this constant is also fixed. (End)
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LINKS
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FORMULA
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sigma = 5.6703744... * 10^-8 W m^-2 K^-4
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MATHEMATICA
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First@ RealDigits@ N[2 Pi^5 (1380649 10^-29)^4 / (15 (662607015 10^-42)^3 299792458^2), 120] (* Jeremy Tan, Jun 13 2019 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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A081823
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Decimal expansion of the elementary charge e in coulombs (C).
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+0
36
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OFFSET
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-18,2
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COMMENTS
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e is exactly 1.602176634*10^(-19) Coulomb according to the SI definition (effective on May 20, 2019). - Ralf Steiner, Dec 29 2018
See the second BIPM link with the CGPM resolutions and A322415. The elementary charge e is one of the seven units of the 2019 SI system. - Wolfdieter Lang, Feb 12 2019
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LINKS
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FORMULA
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e = 1.602176634*10^(-19) Coulomb, [C = A s].
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EXAMPLE
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electron volt, eV = 1.602176634*10^(-19) J.
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Updated to conform with CODATA 2010 recommended value by Raphie Frank, Dec 29 2012
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STATUS
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approved
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