5.3 a₀ (Bohr radius) is equal to 0.0000000002804639419668719 m (meter). To convert from Bohr radius to meter, multiply by 0.00000000005291772489940979 or divide by 18,897,259,886.
physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus