The use and abuse of the terms percent, parts per million and parts in 10n

Abstract

We discuss two different ways in which terms such as percent (%) and parts per million (ppm) are used, both in the scientific literature and in everyday language. We give examples of the way in which these terms may be used without ambiguity, and we also describe common misuse of the terms. We suggest the adoption of the special name uno (symbol U) for the unit one, for use with the International System of Units (SI) prefixes in place of terms such as percent and parts per million in the technical literature.

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