def METHOD_NAME(self):
    net = op.network.Demo()
    N2 = op.phase.Species(network=net, species='n2', name='pure_N2')
    O2 = op.phase.Species(network=net, species='o2', name='pure_O2')
    air = op.phase.BinaryGas(network=net, components=[N2, O2], name='air')