5.3 a₀ (Bohr radius) is equal to 0.000000000013941777119963089 ch (chain). To convert from Bohr radius to chain, multiply by 0.000000000002630523984898696 or divide by 380,152,397,674.6826.
physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus