In general, a reference is something that refers to or designates something else, or acts as a connection or a link between two things. The objects it links may be concrete, such as books or locations, or abstract, such as data, thoughts, or memories. The object which is named by a reference, or to which the reference points, is the referent.
The term reference is used with different specialized meanings in a variety of fields, as follows:
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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.
Meta Description: [ Physics, astronomy and greneral science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations and more - by PhysL ]
Astronomical Constants from NASA - Astronomical/space constants and equations.
Beta-Theta - Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
Meta Description: [ Get Homework Help now at Beta-Theta. Offering online education services for free to students from across the globe. A good, clean website with fast loading time and no pop up ads. ]
EquationSheet.com - Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
Meta Description: [ Create a personal Equation Sheet from a large database of science and math equations including constants, symbols, and SI units. Large equation database, equations available in LaTeX and MathML, PNG image, and MathType 5.0 format, scientific and mathematical constants database, physical science ... ]
GrayLIT Network - Searchable database for reports that are generated by federally funded projects.
Meta Description: [ Provides a full-text search across the gray literature of multiple government agencies within a science portal of technical reports ]
RefScout - 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.
Meta Description: [ RefScout - the weekly scientific reference mailing service! ]
The Constants and Equations Pages - Expanding reference resource for science, math and astronomy
Meta Description: [ Over 600 alphabetically listed Constants, aspects of maths, some 450 equations,Additions & Multiplication tables, Interactive conversions and details on all the standard SI units identities, including complex numbers of measurement, Greek alphabet, electronic symbols and mathematical symbols ]
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