Uncertainty of fundamental physical constants Proposed redefinition of SI base units

(



c


{\displaystyle c}

= speed of light,



α


{\displaystyle \alpha }

= fine-structure constant,




r

∞




{\displaystyle r_{\infty }}

= rydberg constant.)

it should noted relative atomic mass of electron ar(e) measured relative mass of carbon-12 atom (divided 12). when avogadro constant set in new si, atomic masses might measured in dalton (by fixing avogadro constant), instead of atomic mass units (by fixing mass of carbon-12), resulting in difference between values of relative atomic mass , atomic mass in units of dalton.

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