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This publication lists the units of the International System of Units (SI), or metric system, recommended for use in trade and commerce and other general uses by the National Institute of Standards and Technology.
This style guide's purpose is to expedite the correct use of SI metric measurement units in industry, federal/state/local governments, companies of all sizes, schools, and in consumer areas. The first edition of this style guide was published in 1920.
compilation is intended as a guide to the use of the new International Metric System SI in the United States and to disseminate its basic principles so as to enable educators and others to put it to use Pref Contents International System of Units Physical constants and conversion factors United States customary and international metric Guide to ...
The International System of Units, abbreviated SI, is the simplified modern version of the various metric systems. Most metric units are not part of SI, so don’t call it “the metric system.” SI has many advantages: • No conversions. Only one unit for each quantity. • No numbers to memorize. Derived units are defined
This is a unit-at-a-glance list. You can also download a PDF version for off-line use. Table I. Basic units Table II. Derived units with assigned names Table III a. SI Units prefixes Table III b. Binary prefixes for Bytes Table IV. Accepted non-SI units Table V. Accepted non-SI units with experimental values Table VI. Units deprecated by the SI
propagation and improvement of the International System of Units (SI), which is the modern form of the metric system; • confirm the results of new fundamental metrological determinations and various scientific resolutions of international scope; • take all major decisions concerning the finance, organization and development of the BIPM.
marketplace. It also recognized the rapidly expanding use of the SI by amending the Metric Conversion Act of 1975 (PL 94-168). In particular, section 5164 (Metric Usage) of PL 100-418 designates the metric system of measurement as the preferred system of weights and measures for United States trade and commerce . . . and requires that
