Standard atomic weights are widely used in science, yet the uncertainties associated with these values are not well-understood. This recommendation provides guidance on the use of standard atomic weights and their uncertainties. Furthermore, methods are provided for calculating standard uncertainties of molecular weights of substances. Methods are also outlined to compute material-specific atomic weights whose associated uncertainty may be smaller than the uncertainty associated with the standard atomic weights.
Public review ended 31 August 2016
A related Technical Report titled “Interpreting and propagating the uncertainty of the standard atomic weights in PAC, AOP 4 Jan 2018