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| The atomic mass unit and the macroscopic scale mass unit of kilogram in matter are unified by redefining kilogram with carbon onion, which ideally combines the acceptable number defined with its inherent physical significance. A 135887620-layer carbon onion containing 50184508751575328771368200 atoms of C-12 falls in the acceptable range for redefinition of kilogram and is closest to the recent experimental results. An Avogadro constant is thus derived to be 602214105018903945256418.4. A perfect carbon onion is ideal for kilogram redefinition and determination of Avogadro constant because it is expected to exhibit characteristics of central symmetry, high stability, high strength, high spericity, low roughness, weak inter-planar force and strong in-plane bonding, easy atomic counting, etc., and these are important for technical feasibility in further experiments. |
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| Keywords:Redefination of Kilogram; Avogadro constant; Onion-like carbon |
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