Includes reference webpages and tools for general science or those that would apply to several different disciplines. Some examples would be lists of constants, measurement conversions, online calculators, formula tables, exact time, properties of materials, and technical standards.
http://www.beta-theta.com/
Gives general definitions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
http://www.calctool.org/
Directory of simply-presented javascript calculators and equations for making common calculations. Provides quick, simple online calculation and unit conversion tools.
http://knovel.com/
Online reference collection used by applied scientists and practicing engineers to quickly locate technical information.
http://www.physlink.com/Reference/Index.cfm
Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
http://www.diracdelta.co.uk/
Descriptions, equations, calculators, conversions and material data for engineering, mathematics, physics and chemistry.
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