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The ASTM guide is an especially valuable handbook. It includes detailed rules for SI style and usage and for conversion and rounding; a short history of the development of SI; and an extensive list of nonmetric, metric but non-SI, and SI units with factors (4 to 6 decimal places) for converting nonmetric and metric non-SI units to SI units.
Although the use of SI is being widely promoted abroad, as it will be in the United States if the U.S. Metric Study has the impact I expect, not all scientists agree that its units should displace all other metric units
The International System of Units (SI).ASTM Standard Metric Practice Guide: A Guide to the Use of SI—The International System of Units.. Ann Intern Med. 1972;76:339. doi: 10.7326/0003-4819-76-2-339_5
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Published: Ann Intern Med. 1972;76(2):339.
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