code: def Pr(self):
          r'''Prandtl number of the chemical at its current temperature,
          pressure, and phase; [dimensionless].
  
          .. math::
              Pr = \frac{C_p \mu}{k}
  
          Examples
          --------
          >>> Chemical('acetone').Pr
          4.183039103542709
          '''
          return phase_select_property(phase=self.phase, l=self.Prl, g=self.Prgf Pr(self):
          r'''Prandtl number of the chemical at its current temperature,
          pressure, and phase; [dimensionless].
  
          .. math::
              Pr = \frac{C_p \mu}{k}
  
          Examples
          --------
          >>> Chemical('acetone').Pr
          4.183039103542709
          '''
          return phase_select_property(phase=self.phase, l=self.Prl, g=self.Prg)
docs: r'''Prandtl number of the chemical at its current temperature,
          pressure, and phase; [dimensionless].
  
          .. math::
              Pr = \frac{C_p \mu}{k}
  
          Examples
          --------
          >>> Chemical('acetone').Pr
          4.183039103542709