From en.wiktionary.org:
** English
[wikipedia]
*** Noun
[en-noun]
1. [en] a universal constant , R , that appears in the ideal gas law , <math> PV = nRT </math> , derived from two fundamental constant s, the Boltzmann constant and Avogadro's number , <math> R = {N_A}k </math> .
**** Translations
[universal constant R]
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[en]