Usage Notes: Metric Units

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Abstract

In our April issue we started to use the capital “L” as the symbol for the SI unit, the litre. In written text the symbol L will be used alone or in combination with a symbol for an SI prefix only when accompanied by a numeral that reflects a specific measured quantity—for example, 5.2 L; 100 mL; 5 dL. (Symbols for units of measurement may appear without numerals in tables and figures.) This use of the symbol L is based on a recent recommendation of the International Committee for Weights and Measures (CIPM) that the General Conference on Weights and

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