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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.
The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. The SI is the dominant measurement system used in science and international commerce. In recognition of this fact, Congress has designated the metric system of measurement as the
The SI version of the metric system was established by the CGPM in 1960. Previous versions of the metric system, such as the centimeter gram second (CGS) and meter kilogram second ampere (MKSA), are no longer acceptable and should not be used.
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
Metric System of Measurement: Interpretation of the International System of Units for the United States, Federal Register 63, No.144, July 28, 1998. For more, see References on Systems of Units of Measurements
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 without numerical factors.
SI UNITS AND CONVERSION TABLES Measurement Unit Symbol Equivalents Length 1 millimeter mm 1000 micrometers (µm) 1 centimeter cm 10 millimeters (mm) ... Common SI Units Metric Conversion Tables When You Know Fahrenheit subtract 32; then divideby 1.8 to find Celsius Celsius multiply by 1.8; then add32 to find Fahrenheit.
