摘要：Therelative atomic massAr, is theweighted average massof anatomof an element, relative toone twelfth of the mass of an atom of car

A mass spectrometer creates the mass spectrum. It can be used to find the relative atomic mass of an element.

The relative atomic mass Ar , is the weighted average mass of an atom of an element, relative to one twelfth of the mass of an atom of carbon-12.

来源：安娜说留学