From Wikipedia, the free encyclopedia
Atómová hmotnostná jednotka alebo atómová hmotnostná konštanta je 1/12 hmotnosti atómu uhlíka 12C v pokoji.
Značka: u alebo mu alebo amu (z angl. atomic mass unit)
Veľkosť: u = (1,660 538 782±0,000 000 028)×10-27 kg = 1/12. ma(126C)
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