Speed of light.
value = clight
clight
returns the value of the vacuum speed of light in
SI units (meters/second) in value
.
The value is taken from the 2018 CODATA collection of recommended values.
amu, angstrom, avogadro, barn, bmagn, bohrrad, boltzm, echarge, emass, eps0, evolt, faraday, gammae, gfree, hartree, hbar, molgas, mu0, nmagn, nmass, planck, pmass, rydberg