The unit of length in the atomic system of units. It is equal to the Bohr radius, which is approximately the radius of maximum electron density in the hydrogen atom, about 5.291 772 085 9 × 10−11 meter, with a 1 standard deviation uncertainty of ± 0.000 003 6.1
1. 2006 CODATA value.
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Last revised: 21 April 2007.