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Physics and Science Reference by PhysLINK.com
Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
Astronomical Constants from NASA
Astronomical/space constants and equations.
A weekly, scientific reference mailing service. Screens databases covering life and medical sciences for the key words or the combination of key words specified and will automatically update with any abstract that has come up during the last seven days. Free service.
The Constants and Equations Pages
Expanding reference resource for science, math and astronomy
Molecular Weight Calculation
Web-based utility for finding the molecular weight of any chemical for which you enter the formula.
Searchable database for reports that are generated by federally funded projects.
Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.