The NIST Reference on Constants, Units and Uncertainty (Popularity: ): Values recommended for international use by the Committee on Data for Science and Technology, International Council of Science. Navigation is by text search. The Laws List (Popularity: ): An alphabetical glossary of the various laws and theorems in this science. Physics FAQ (Where to Find It) (Popularity: ): Links where to find the FAQ documents for physics. Eqndb (Popularity: ): Search for physics equations and constants by keywords and symbols. The Physics Reference (Popularity: ): Site contains every formula a first-year physics student is likely to run into. Physical Reference Data (Popularity: ): Held at NIST Physics Laboratory.
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