The definitive reference for thermal constants Thermal Constants of Substances is an authoritative reference for chemists and physicists in a wide range of disciplines. Provided as an eight-volume set, this reference provides critically selected and self-consistent thermal constants for all inorganic, simple organic, and metallo-organic substances studied — over 25,000 in all. Over 51,500 references are included for further information, with some literature dating back to the 1800s. Organized alphabetically and cross-referenced for convenience, this reference has a permanent home on the bookshelves of labs around the world.