The present Table of Standard Atomic Weights (TSAW) of the elements is perhaps one of the most familiar data sets in science. Unlike most parameters in physical science whose values and uncertainties are evaluated using the “Guide to the Expression of Uncertainty in Measurement” (GUM), the majority of standard atomic-weight values and their uncertainties are consensus values, not GUM-evaluated values. The Commission on Isotopic Abundances and Atomic Weights of the International Union of Pure and Applied Chemistry (IUPAC) regularly evaluates the literature for new isotopic-abundance measurements that can lead to revised standard atomic-weight values, A_r°(E) for element E.

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标准原子量表——共识练习

目前的元素标准原子量表 (TSAW) 可能是科学界最熟悉的数据集之一。与使用“测量不确定度表达指南”（GUM）评估值和不确定性的大多数物理科学参数不同，大多数标准原子量值及其不确定性是共识值，而不是 GUM 评估值。国际纯粹与应用化学联合会 (IUPAC) 的同位素丰度和原子量委员会定期评估文献以获取新的同位素丰度测量值，这些测量值可能导致元素 E 的修订标准原子量值A _r °(E) .