and Calculators Scale
Periodic chart that includes many details about the elements,
along with pictures and histories. The professional
edition includes more nitty-gritty details. Maintained by Mark
Winter of the University of Sheffield in England.
Clear explanations of many of the laws, rules, principles, effects,
paradoxes, limits, constants, experiments, and thought experiments
of physics. Maintained by programmer Erik Max Francis.
List of Internationally recommended values for fundamental physical
constants like the speed of light. Maintained by The U.S. National
Institute of Standards and Technology (NIST).