Quantum systems introduce angular momentum in very particular ways involving vorticity or irrotational waves near the boundaries.  This is in complete contrast with classical gases where internal vorticity has none of the volume excluding energy cost of quantum gases.  We are generally weak at all aspects of the classical-quantum transition.  Gases seem like a great place to explore this, nevertheless, most research on them uses fitting to classical hydro or GP type equations outside the domain of their known validity.