5.3 a₀ (Bohr radius) is equal to 0.000000000001394177711996309 fur (furlong). To convert from Bohr radius to furlong, multiply by 0.0000000000002630523984898696 or divide by 3,801,523,976,746.8267.
physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus