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Purdue University,
School of Health Sciences Physical Constants, Units and Uncertainties Frequently Used Sites |
The National Institutes of Standards and Technology (NIST) maintains many useful websites related to the physical sciences, including
- Fundamental Physical Constants (speed of light, mass of elementary particles, etc., etc.).
- Guidelines for evaluating and expressing measurement uncertainty
- International System of Units (SI).
NOTE: NIST is the definitive source for information on physical quantities and units within the U.S.
Last Updated: January 08, 2006