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In page Hydrogen:
"Solid hydrogen can be made at standard pressure, 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.[citation needed] Multiple distinct solid phases exist, known as Phase I through Phase V, each exhibiting a characteristic molecular arrangement.[2] Liquid and solid phases can exist in combination at the triple point, a substance known as slush hydrogen.[3]