Physics and astrophysics

Summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to change them into a 'standard' unit of the S I.

Data on physical, thermodynamic, mechanical, and other key properties used in chemistry, physics, and engineering. Some tables are interactive

Data on constants and related precision measurements provided by the NIST Physics Laboratory

Comprising 901 tables concentrating on a broad scope of common physical and chemical data; of interest to scientists and engineers but especially in physics in its larger sense.

Comprehensive research platform with information on materials, their properties and uses.