Does liquid water have ordered structure? I.e., are there significant domains of ordered H2O molecules that maintain crystallinity - translational symmetry - in liquid water at room temperature? I guess this is essentially a hydrogen bonded network - How big are these domains? Or are they mostly disordered, closely packed molecules without short-range or medium-range order? Is there a temperature dependence to domain size? What determines if there are voids or vacancies or free molecules?