5.3 a₀ (Bohr radius) is equal to 0.000000028046394196687186 cm (centimeter). To convert from Bohr radius to centimeter, multiply by 0.000000005291772489940979 or divide by 188,972,598.86.
physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus