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Physical and Chemical Data, Properties, Conversion Factors

Websites for Units Conversion: 
Science Made Simple - Unit Conversions 
Conversion of Units, Institute of Chemistry (Freie Universitat, Berlin) 
Online Conversion 
Calculators On-Line Center

Chemistry WebBook 
Provides chemical and physical property data compiled by NIST under the Standard Reference Data Program.

Search for property data.

The Laws List 
Laws, rules, principles, effects, paradoxes, limits, constants, experiments, & thought experiments in physics.

NIST Physics Laboratory 
National Institute of Standards and Technology. Physical Reference Data, Constants, Units & Uncertainty, detailed information on SI units, articles, publications, and more.

Periodic Table (WebElements) 
Includes background information, chemical and physical data.  

Tables Removed from CRC Handbook of Chemistry and Physics, 71st through 87th Editions Provides locations in 88th edition (2007-08) of the Handbook for tables that have been removed, retitled, or rearranged. For tables that are no longer in the handbook, the last edition in which the table appeared is listed.