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Dimensions

The physical significance of R is work per mole per kelvin. It may be expressed in any set of units representing work or energy (such as joules), units representing temperature on an absolute scale (such as kelvin or rankine), and any system of units designating a mole or a similar pure number that allows an equation of macroscopic mass and fundamental particle numbers in a system, such as an ideal gas (see Avogadro constant).