pub const c: Value
The speed of light in a vaccuum, in meters per second
pub const e: Value
Elementary charge, in coloumbs
pub const h: Value
The Planck constant, in joule-seconds
pub const k: Value
The Boltzmann constant, in joules per kelvin
pub const k_cd: Value
The luminous efficacy of 540 THz radiation
pub const n_a: Value
Avogadro’s number, in inverse moles
pub const v_cs: Value
The hyperfine transition frequency of Cs, in hertz