@property<EOL><INDENT>def Pr(self):<DEDENT>
return phase_select_property(phase=self.phase, l=self.Prl, g=self.Prg)<EOL>
r'''Prandtl number of the mixture at its current temperature,
        pressure, and phase; [dimensionless].
        Available only if single phase.

        .. math::
            Pr = \frac{C_p \mu}{k}

        Examples
        --------
        >>> Mixture(['acetone'], ws=[1]).Pr
        4.183039103542711