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abstraction > mathematical concept > unit > non SI unit > unified atomic mass unit
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unified atomic mass unit comparison table
Subject has value in SI unit is an instance of is a kind of has symbol has definition
non SI unit  unit not an SI unit, but an important and widely used unit
unified atomic mass unit1.66054 × 10-27 kg, approximatelynon SI unit u 

Next non SI unitangstrom    Upnon SI unit    Previous non SI unitsecond (angle)