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Our periodic table has over 25000 facts covering all chemical elements and spanning more than 130 quantities. Each table entry has a full citation identifying its source. Our units and constants handbook features descriptions of the 391 units and 74 constants supported by our unit conversion calculators.
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Online Conversion is a resource for weights, measures, calculators, converters.
Infoplease is a free, authoritative, and respected reference for Internet users that provides a comprehensive encyclopedia, almanac, atlas, dictionary, and thesaurus.
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Explore the chemical elements through this periodic table
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Online converters for weights and measures. Calculators for quick and easy metric conversion. Conversion tables for both commonly used and very exotic units.
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Periodic table of elements with information on chemical elements like gold, silver, iron, neon, helium, chlorine, copper, cobalt, and more
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The Bureau of Labor Statistics is the principal fact-finding agency for the Federal Government in the broad field of labor economics and statistics.
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