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1. www.nist.gov › pml › owmSI Units | NIST - National Institute of Standards and Technology

   www.nist.gov › pml › owm

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   12 kwi 2010 · The SI is made up of 7 base units that define the 22 derived units with special names and symbols, which are illustrated in NIST SP 1247, SI Base Units Relationship Poster. The SI plays an essential role in international commerce and is commonly used in scientific and technological research and development.

   • Metrication FAQs

     From a technical perspective, it’s impossible to avoid using...

   • National Metric Week

     The NIST Metric Program invites you to celebrate National...

   • Everyday Estimation

     Estimation is more than taking a guess! The ability to...

   • Metric Kitchen

     Welcome to the NIST Metric Kitchen! The most frequent...

   • Everyday with Metric

     Consumers have varying levels of awareness of measurement in...

   • SI Education & Training

     SI Basics – Learn more about the 7 base units that define 22...

   • Unit Conversion

     Teach non-SI unit conversions only when required. Teach the...

   • Metric Policy

     The relationship between SI length measurement units and the...

2. www.nist.gov › si-redefinition › definitions-si-base-unitsDefinitions of SI Base Units | NIST

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   29 maj 2019 · As you can see above, the units in the revised SI are based completely on seven unchanging quantities or “universal constants,” including the speed of light, the amount of electric charge in an electron, and the Planck constant. Learn more about each of these “invariants of nature” and how they come into play in the revised SI.

3. www.nist.gov › si-redefinitionSI Redefinition | NIST - National Institute of Standards and...

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   The SI — the modern metric system — has seven base units from which all other measurement units can be derived. On May 20, 2019, four of them — the kilogram, kelvin, ampere and mole — were redefined in terms of constants of nature.

4. nvlpubs.nist.gov › nistpubs › SpecialPublicationsThe International System of Units (SI), 2019 Edition - NIST

   nvlpubs.nist.gov › nistpubs › SpecialPublications

   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

5. physics.nist.gov › cuu › pdfGuide for the Use of the International System of Units (SI) -...

   physics.nist.gov › cuu › pdf

   The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités ), is the modern metric system of measurement. Long the dominant measurement

6. nvlpubs.nist.gov › nistpubs › LegacyThe International System of Units (SI) – Conversion Factors ... -...

   nvlpubs.nist.gov › nistpubs › Legacy

   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.

7. physics.nist.gov › cuu › pdfThe International System of Units (SI) - NIST

   physics.nist.gov › cuu › pdf

   The International System of Units, universally abbreviated SI (from the French Le Syste`me International d’Unite´s ), is the modern metric system of measurement. Long the dominant system used in science, the SI is