@property<EOL><INDENT>def R_specific(self):<DEDENT>
return property_molar_to_mass(R, self.MW)<EOL>
r'''Specific gas constant of the mixture, in units of [J/kg/K].

        Examples
        --------
        >>> Mixture(['N2', 'O2'], zs=[0.79, .21]).R_specific
        288.1928437986195