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relative atomic mass

noun

  1. the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12 Ar r.a.m. Former nameatomic weight
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


relative atomic mass

/ rĕlə-tĭv /

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relative aperturerelative bearing