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To help compare different orders of magnitude we list here masses between 0.602 amu and 6.02 amu (10-27 kg and 10-26 kg). See also masses of other orders of magnitude. lighter masses 1.6605402 × 10-27 kg = 1 atomic mass unit (amu) 1.6726231 × 10-27 kg -- mass of a proton heavier masses