Solid hydrogen is the solid state of the element hydrogen, achieved by decreasing the temperature below hydrogen's melting point of 14.01 K (−259.14 °C). It was collected for the first time by James Dewar in 1899 and published with the title "Sur la solidification de l'hydrogène" in the Annales de Chimie et de Physique, 7th series, vol.18, Oct. 1899. Solid hydrogen has a density of 0.086 g/cm3 making it one of the lowest density solids.
- Compressed hydrogen
- Liquid hydrogen
- Slush hydrogen
- Metallic hydrogen
- Timeline of hydrogen technologies
- "Properties of solid hydrogen at very low temperatures" (2001)
- "Solid hydrogen experiments for atomic propellants"
- Melting Characteristics and Bulk Thermophysical Properties of Solid Hydrogen", Air Force Rocket Propulsion Laboratory, Technical Report, 1972
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