This modern value for the gas constant was assigned in YEAR (add).

History

The first dominant use of

This is sometimes referred to as the 'G-M law' or the 'law of Marriatte and Gay-Lussac'.

In 1850, German physicist Rudolf Clausius updated the work of Clapeyron using the 1847 work of French chemist Henri Regnault, where he reevaluated the content inside of the parentheses, rewriting the gas equation as: [3]

In 1864, Clausius further simplified this expression by using the absolute temperature scale, conceived by Irish physicist William Thomson in 1848:

where

The first person to convert R into a universal gas constant, according to American chemistry historian William Jensen, was German chemist August Horstmann who in 1873 rewrote the previous equation as: [4]

where

or

This later version of the equation, with the explicit use of "n" as the number of mols, seems to have been first use in the classic 1923 textbook

Symbol etymology

The origin of the symbol R, prior to its 1834 use by Clapeyron, is difficult to pin down. This seems to be due to the fact often early versions of the gas laws were simply stated verbally.See main: R (etymology section)

References

1. Daintith, John. (2005).

2. Clapeyron, Émile. (1834). “Memoir on the Motive Power of Heat”,

3. Clausius, Rudolf. (1850). “On the Moving Force of Heat and the Laws of Heat which may be Deduced Therefrom” (pg. 21), Communicated to the Academy of Berlin, Feb.; Published in Poggendorff’s

4. Jensen, William B. (2003). “The Universal Gas Constant R” (abstract: “this column traces the history of the gas constant R and the probable reason for its representation by the letter R.),

5. Horstmann, August F. (1973). “Theorie der Dissociation”,

6. Lewis, Gilbert N. and Randall, Merle. (1923).

External links

● Gas constant – Wikipedia.