In the recent (2019) revision of the SI units that anchors the system in a set of defined constants (see this section), the value of the gas constant R is now exact, being the product of the Avogardro constant NA and the Boltzmann constant k,
R = NA × k,
where NA = 6.022 140 76 × 1023 mol-1 (exact)
and k = 1.380 649 × 10-23 J K-1 (exact),
resulting in the exact values listed below:
R = 8.314 462 61815 Pa m3 K-1 mol-1 = 8314.462 618 15 Pa L K-1 mol-1 = 0.0831 446 1815 bar L K-1 mol-1
This table gives the appropriate value of R for use in the ideal gas equation, PV = nRT, when the variables are expressed in other units. The change from the previously accepted value of R is in the seventh significant figure and for all practical purposes has resulted in no changes to this table. The following conversion factors for pressure units were used in generating the table.
1 atm = 101325 Pa 1 psi = 6894.757 Pa 1 torr (mmHg) = 133.322 Pa [at 0 °C] 1 in Hg = 3386.38 Pa [at 0 °C] 1 in H2O = 249.082 Pa [at 4 °C] 1 ft H2O = 2988.98 Pa [at 4 °C]
The CRC Handbook of Chemistry and Physics (HBCP) contains over 700 tables in over 450 documents which may be divided into several pages, all categorised into 17 major subject areas. The search on this page works by searching the content of each page individually, much like any web search. This provides a challenge if you want to search for multiple terms and those terms exist on different pages, or if you use a synonym/abbreviation that does not exist in the document.
We use metadata to avoid some of these issues by including certain keywords invisibly behind each table. Whilst this approach works well in many situations, like any web search it relies in the terms you have entered existing in the document with the same spelling, abbreviation etc.
Since chemical compounds and their properties are immutable, a single centralised database has been created from all chemical compounds throughout HBCP. This database contains every chemical compound and over 20 of the most common physical properties collated from each of the >700 tables. What's more, the properties can be searched numerically, including range searching, and you can even search by drawing a chemical structure. A complete list of every document table in which the compound occurs is listed, and are hyperlinked to the relevant document table.
The 'Search Chemicals' page can be found by clicking the flask icon in the navigation bar at the top of this page. For more detailed information on how to use the chemical search, including adding properties, saving searches, exporting search results and more, click the help icon in to top right of this page, next to the welcome login message.
Below is an example of a chemical entry, showing its structure, physical properties and document tables in which it appears.
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