

A081799


Decimal expansion of the electric permittivity of vacuum in SI units as defined before 20 May 2019.


16



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
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OFFSET

11,1


COMMENTS

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


LINKS

Table of n, a(n) for n=11..92.
NIST, electric constant epsilon_0.
Wikipedia, Vacuum permittivity


FORMULA

Equals 10^6/(A019694*A003678^2).  R. J. Mathar, May 05 2006; corrected by Arkadiusz Wesolowski, Feb 03 2017
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


EXAMPLE

8.854187817...*10^12 F m^1.


MAPLE

Digits := 105 : A003678 := 2.99792458e8 : A019694 := 4*Pi*1.0e7 ; evalf(1/A019694/A003678^2) ; # R. J. Mathar, May 05 2006


CROSSREFS

Other assigned constants: A003678, A182999, A019694, A213610, A072915, A213611, A213612, A213613, A213614.
Sequence in context: A021117 A335414 A305208 * A154186 A030171 A153619
Adjacent sequences: A081796 A081797 A081798 * A081800 A081801 A081802


KEYWORD

cons,nonn


AUTHOR

Benoit Cloitre, Apr 10 2003


EXTENSIONS

More terms from R. J. Mathar, May 05 2006
Description updated by Ivan Panchenko, May 22 2019


STATUS

approved



