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Astronomical Constants from NASA - Astronomical/space constants and equations.
 
Biocatalysis/Biodegradation Database - University of Minnesota Biocatalysis/Biodegradation Database lists microbial biocatalytic reactions and biodegradation pathways primarily for xenobiotic, chemical compounds.
 
Engineer's Reference - Compendium of engineering information. Theory, formulas, economic information, regulatory information and more.
 
Engineering Power Tools - Engineering software solves many common engineering problems quickly and efficiently. Includes unit converter, and many frequently- used data tables such as physical constants, properties of materials, screw threads, piping pressure drop, etc. Free downloads. Win3.x/95/98/NT.
 
Erik Max Francis' physics pages - Information on Kepler's laws, the laws list, illustrated orders of magnitude, a physics reference, and more.
 
Favorite Mathematical Constants - An in-depth explanation of the most important math constants.
 
Fundamental Physical Constants from NIST - CODATA Internationally recommended values for a wide range of physical parameters (speed of light, Avogadro's constant, masses of elementary particles, Planck constant, acceleration of gravity, etc.)
 
GrayLIT Network - Provides a full-text search across the gray literature of multiple government agencies within a science portal of technical reports.
 
Ideal Answers - Interactive, computational resource for engineers and researchers focusing on thermal and mechanical aspects of electronic packaging.
 
International Network for the Availability of Scientific Publications - Co-operative network of partners aiming to improve world-wide access to information.
 
Molecular Weight Calculation - Web-based utility for finding the molecular weight of any chemical for which you enter the formula.
 
Physics and Science Reference by PhysLINK.com - Physics / science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations and more.
 
Resources For Engineering Students - From Agilent Technologies
 
The Constants and Equations Pages - Expanding reference resource for science, math and astronomy
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