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Units of Measure

Phil B. Fontanarosa

and Stacy Christiansen

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The SI unit for time is the second, although minute, hour, and day also are used. Other units of time, such as week, month, and year, are not part of the SI but also are used. The abbreviations for minute, hour, and day are min, h, and d, respectively, and the abbreviations for week, month, and year are wk, mo, and y, respectively. These abbreviations are used in tables, figures and virgule constructions. (See 14.12, Abbreviations, Units of Measure.)

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