def VolumetricFlow(self):
    """Volumetric flow (m^3/hr)."""
    stream, mol, phase = self.data
    if mol:
        c = self.name # c: compound
        c.T = stream.T
        c.P = stream.P
        c.phase = phase
        return (c.Vm * mol[0] * 1000.)
    else:
        return 0.