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Bipm: The International System of Units (Si)
BIPM (Bureau International des Poids et Mesures) is an international organization, located in France, an equivalent of our National Institute of Standards and Technology (NIST). This site is the BIPM intro page to their official...
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Houston Community College: Physical Quantities and Units
Learn about physical quantities, SI units, and derived units in this chapter of a physics of textbook.
Texas Education Agency
Texas Gateway: Glossary for Introduction to Physics
This is a glossary of terms and definitions used in AP Physics: Chapter 1: Introduction to Physics.