Search: a322578 -id:a322578
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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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+10
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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A081823
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Decimal expansion of the elementary charge e in coulombs (C).
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+10
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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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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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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+10
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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A070064
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Decimal expansion of the molar gas constant R according to the 2019 SI system in units J mol^-1 K^-1.
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+10
16
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8, 3, 1, 4, 4, 6, 2, 6, 1, 8, 1, 5, 3, 2, 4
(list;
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refs;
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history;
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OFFSET
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1,1
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LINKS
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FORMULA
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CROSSREFS
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Cf. A081822 (constant according to IUPAC).
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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 the May 20 2019 redefinition of the SI base units by Sean A. Irvine, Jun 20 2019
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STATUS
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approved
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A230458
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Decimal expansion of Δν_{Cs} in unit s^{-1}; one of the seven units of the 2019 SI system.
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+10
13
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OFFSET
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10,1
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COMMENTS
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The second s is defined to be exactly 9192631770 periods of the resonance frequency of the hyperfine transition of the cesium 133 atom.
Prime factors of this number are 2^1, 3^2, 5^1, 7^2, 47^1, 44351^1. - John W. Nicholson, Jun 15 2014
The value was fixed in 1968 by the 13th CGPM in terms of periods of the radiation due to the transition between the two hyperfine levels of the ground state of 133Cs atoms. - Stanislav Sykora, Mar 30 2015
In the 2019 SI system of units (see the BIPM link, and A322415) one of the seven units is Δν_{Cs} = Δν(^{133}Cs)_{hfs} = 9192631770 s^{-1}. - Wolfdieter Lang, Feb 12 2019
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LINKS
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FORMULA
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Δν_{Cs} = 9192631770 s^{-1}.
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EXAMPLE
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c = 9192631770 m/s.
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MATHEMATICA
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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A070062
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Decimal expansion of old estimate for Avogadro's constant (in mol^(-1)).
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+10
3
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OFFSET
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24,1
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COMMENTS
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For the exact Avogadro constant N_A = 6.02214076*10^23 mol^(-1) according to the 2019 SI system of units see A322578. - 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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FORMULA
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6.02214199*10^23 per mol.
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CROSSREFS
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KEYWORD
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dead
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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A087778
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Decimal expansion of experimental Avogadro's constant (in mol^(-1)).
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+10
3
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OFFSET
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24,1
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COMMENTS
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Defined to be number of atoms in 12 grams of carbon-12.
This originally was the value as of October 2003.
For the exact Avogadro constant N_A = 6.02214076*10^23 mol^(-1) according to the 2019 SI system of units see A322578. - Wolfdieter Lang, Feb 12 2019
By definition, the "experimental Avogadro's constant" still makes sense in the 2019 SI as the gram to atomic mass unit ratio, but its current value provided by CODATA is (within the experimental error) identical to the exact Avogadro constant and different from an older value provided in this entry. So the value provided here is obsolete anyway. - Andrey Zabolotskiy, Sep 12 2023
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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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FORMULA
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6.02214179*10^23 +- 3.0*10^16 per mol.
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CROSSREFS
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KEYWORD
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dead
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AUTHOR
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EXTENSIONS
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Adapted offset and value to current NIST values by R. J. Mathar, Jul 23 2009
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STATUS
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approved
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A129106
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Decimal expansion of proposed value for Avogadro's number, namely 602214141070409084099072 = 84446888^3.
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+10
3
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6, 0, 2, 2, 1, 4, 1, 4, 1, 0, 7, 0, 4, 0, 9, 0, 8, 4, 0, 9, 9, 0, 7, 2
(list;
constant;
graph;
refs;
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history;
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OFFSET
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24,1
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COMMENTS
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For the exact value for the Avogadro constant is N_A = 6.02214076*10^{23} mol^{-1} according to the 2019 SI system of units see A322578. - Wolfdieter Lang, Feb 12 2019
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LINKS
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CROSSREFS
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KEYWORD
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STATUS
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approved
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A081825
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Decimal expansion of atomic mass constant, in kg.
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+10
2
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OFFSET
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-26,2
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COMMENTS
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The atomic mass constant (with symbol Da or u) is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.
We have 1.66053906610*10^(-27) kg <= 1 u <= 1.66053906710*10^(-27) kg. Multiplying this by the Avogadro constant (A322578) we get 0.0009999999993533... kg/mol <= (1 u)*N_A <= 0.0009999999999555... kg/mol. In other words, 1 u is strictly less than (but very close to) (0.001 kg/mol)/N_A after the redefinition of SI units in 2019. (End)
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LINKS
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CROSSREFS
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Cf. A081813 (atomic mass constant in MeV/c^2).
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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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A163999
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Decimal expansion of the Faraday constant according to the 2019 SI system.
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+10
1
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9, 6, 4, 8, 5, 3, 3, 2, 1, 2, 3, 3, 1, 0, 0, 1, 8, 4
(list;
constant;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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5,1
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COMMENTS
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In C mol^-1. Some use C (mol e^-1)^-1 = C Eq^-1.
The Faraday constant is the magnitude of electric charge per mole of electrons.
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LINKS
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FORMULA
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EXAMPLE
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Equals 96485.3321233100184 C mol^(-1) (exact). -`Jianing Song, Jul 06 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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Updated to the May 20 2019 redefinition of the SI base units by Jianing Song, Jul 06 2019
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STATUS
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approved
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