ICT contains the best (critical) data derived from the literature up to 1924. It includes data on physical, thermodynamic, mechanical, and other important properties for chemistry, physics, and engineering. The data is presented as text, equations, tables, graphs, and charts. ICT is fully searchable and the index is hyperlinked to the data.
Contains the entire 16th edition (1995) of Kaye and Laby's Tables of Physical and Chemical Constants. It is freely available from the UK's National Physical Laboratory, and includes important physical and chemical property data. Kaye and Laby Online is searchable, or may be browsed. Note: this is an archived version as the site is no longer being updated.
Knovel Critical Tables (kCT) are based on the International Critical Tables of Numeric Data, Physics, Chemistry, and Technology, and include up-to-date, evaluated data on over 13,000 compounds. The tables contain data on organic and inorganic compounds, and pure substances. New tables will be added to kCT on a regular basis. kCT is fully searchable.
The Smithsonian Physical Tables cover a wide range of common physical and chemical data. It includes general physical constants and units of measurement as well as tables on photometry, mechanical properties, building materials, density, acoustics, diffusion, geomagnetism, radiation, abundance of substances, colloids, electron emission, fission, and gravitation. The 901 tables are fully searchable and the index is hyperlinked to the data.