Unsolved mysteries of water in its liquid and glass states

The local structural heterogeneities that appear in water, the liquid state and the glass state were characterized. Specifically, the state points of liquid water at different pressures especially near its phase boundaries with ice I, and with ice VI (a high-pressure polymorph of solid H2O) were considered. A model of interacting water pentamers, was developed and found two distinct local-energy minima which two well-defined configurations of neighboring pentamers were identified. The Walrafen pentamer is defined by four water molecules, located at the corners of a tetrahedron, that are hydrogen-bonded to a central molecule. An experiments on real water and by simulations of what is sometimes called computer water are presented.