Please forward this error screen to 198. Not to be confused with atomic mass. For example, a sample of elemental carbon from volcanic methane will have a different relative atomic mass than one collected from plant or animal atomic number of elements pdf. The well-known standard atomic weight is an application of this relative atomic mass values from different samples.
They are the most published form of the relative atomic mass, because they are not sample-specific, but cover a broad range of expected Earth samples. 1960s, mainly due to the technical difference between weight and mass in physics.
Both terms are officially sanctioned by IUPAC. Relative atomic mass is determined by the average atomic mass, or the weighted mean of the atomic masses of all the atoms of a particular chemical element found in a particular sample, which is then compared to the atomic mass of carbon-12.
This quotient also explains the word relative: the sample mass value is made relative to carbon-12. Relative atomic mass is frequently used as a synonym for the standard atomic weight and these will have overlapping values if the relative atomic mass used is that for an element from Earth under defined conditions.