@property<EOL><INDENT>def mug(self):<DEDENT>
return self.ViscosityGas(self.T, self.P)<EOL>
r'''Viscosity of the chemical in the gas phase at its current
        temperature and pressure, in units of [Pa*s].

        For calculation of this property at other temperatures and pressures,
        or specifying manually the method used to calculate it, and more - see
        the object oriented interface
        :obj:`thermo.viscosity.ViscosityGas`; each Chemical instance
        creates one to actually perform the calculations.

        Examples
        --------
        >>> Chemical('water', T=320, P=100).mug
        1.0431450856297212e-05