Instructions for using the NIST-JANAF Thermochemical Tables

This database contains the data tables of the NIST-JANAF Thermochemical Tables.  The compounds in these tables are fully searchable via two interfaces which are described in the following paragraphs.

The first search method involves the use of the text-based form on the front page of the database web site.  Users may enter a CAS registry number (with or without the dashes), a chemical name, or a chemical formula.  Case is not significant in the input.  When entering the chemical formula for an ion, place the symbol for the charge at the end of the formula.  Search results may be restricted to a specific state by use of the "Specify state" popup.  The abbreviations used in the popup are cr (crystal), l (liquid), fl (fluid), g (gas), and ref (reference state).  Checking the box next to "Allow partial matches" will broaden the search to include any compounds matching the characteristics of the users input.  Partial matching is only used for chemical formula searches.  Note that if you include a number after an atomic symbol in a partial match, only compounds containing that number of the specified atom will be returned.  If no number is present after the atomic symbol, any compound which contains any (non-zero) number of the specified atom will be returned.

The second method for searching involves selecting one atom of interest from a periodic table interface.  Clicking on an atom will return all compounds in the database which contain that atom.

Results are returned in a tabular format.  The results table contains columns with information on CAS registry numbers, chemical formula, compound name, and state and links to the NIST-JANAF thermochemical table and to the NIST Chemistry WebBook if available.