Metallic hydrogen (mH2) exhibits exceptional properties, including high electrical and thermal conductivity, density, and weak magnetic susceptibility. Its chemical reactivity involves forming hydrides with oxidizing agents. Potential applications lie in energy storage. mH2 exists in molecular (H2), liquid (mH2-I), and solid (mH2-II) forms. Diamond anvil cells, dynamic compression, and laser-driven shock experiments are used for its study. Theoretical approaches like density functional theory and superconductivity theory contribute to its understanding. mH2 has interdisciplinary connections in high-pressure physics, condensed matter physics, astrochemistry, and materials science.
