Solid hydrogen is the solid state of the element hydrogen, achieved by decreasing the temperature below hydrogens melting point of . It was collected for the first time by James Dewar in 1899 and published with the title "Sur la solidification de lhydrogène" (English: On the freezing of hydrogen) in the Annales de Chimie et de Physique, 7th series, vol. 18, Oct. 1899.  Solid hydrogen has a density of 0.086 g/cm making it one of the lowest-density solids.