  The inter oxygen repulsion opposes compression minimizing the
compressibility. Polarization enlarges the bandgap and the dielectric
permittivity of water ice by raising the nonbonding states above the Fermi
energy. Progress evidences the efficiency and essentiality of the coupled
hydrogen bonding and electronic dynamics in revealing the core physics and
chemistry of water ice, which could extend to other molecular crystals such as
energetic materials.
