Solid hydrogen is the solid state of the element hydrogen, achieved by decreasing the temperature below hydrogen’s melting point.
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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; −434.45 °F). It was collected for the first time by James Dewar in 1899 and published with the title “Sur la solidification de l’hydrogène” (English: On the solidification of hydrogen) in the Annales de Chimie et de Physique, 7th series, vol. 18, Oct. 1899.[1][2] Solid hydrogen has a density of 0.086 g/cm3 making it one of the lowest-density solids.