Electric constant, vacuum permittivity.

value = eps0
[value,sigma] = eps0

eps0 returns the value of the electric constant (vacuum permittivity) in SI units in value and the standard deviation in sigma (if two output arguments are specified).

The value and the standard deviation are taken from the 2018 CODATA collection of recommended values.

amu, angstrom, avogadro, barn, bmagn, bohrrad, boltzm, clight, echarge, emass, evolt, faraday, gammae, gfree, hartree, hbar, molgas, mu0, nmagn, nmass, planck, pmass, rydberg