@property<EOL><INDENT>def Vmg(self):<DEDENT>
return self.VolumeGas(self.T, self.P)<EOL>
r'''Gas-phase molar volume of the chemical at its current
        temperature and pressure, in units of [m^3/mol]. For calculation of this
        property at other temperatures or pressures, or specifying manually the
        method used to calculate it, and more - see the object oriented interface
        :obj:`thermo.volume.VolumeGas`; each Chemical instance
        creates one to actually perform the calculations.

        Examples
        --------
        Estimate the molar volume of the core of the sun, at 15 million K and
        26.5 PetaPascals, assuming pure helium (actually 68% helium):

        >>> Chemical('helium', T=15E6, P=26.5E15).Vmg
        4.805464238181197e-07