A081799 Decimal expansion of the electric permittivity of vacuum in SI units as defined before 20 May 2019.

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

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

The new value after the redefinition is equal to A081823^2/(2 * A003673 * A003676 * A003678). - Jianing Song, Aug 11 2022

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*1.0e-7 ; 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