5.3 a₀ (Bohr radius) is equal to 0.000000002804639419668719 dm (decimeter). To convert from Bohr radius to decimeter, multiply by 0.0000000005291772489940979 or divide by 1,889,725,988.6.
physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus