Scientific Reference

Physics and Science Reference by PhysLINK.com
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Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.

Beta-Theta
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Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.

The Constants and Equations Pages
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Expands reference resources for science, maths, and astronomy.