| Abstract | David Newell’s article (Physics Today, July 2014, page 35) on proposed changes to the International System of Units (SI) was an enjoyable read. The author was able to condense the key points of a rather complicated subject into a few pages. As he pointed out, the SI has undergone continuous improvement over its long history, so the focus on an improved standard for mass seems well justified. However, I am not convinced that the changes in the base quantities, as illustrated in tables 1 and 2 of Newell’s article, are a wise choice. |
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