| "Melting Points of Aluminum, Silver, Gold, Copper, and Platinum" | |
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| Helium does not solidify at a pressure of one atmosphere | by Thomas Carnelley Harrison, London, 1885—1887• by Thomas Carnelley Harrison, London, 1885—1887 |
| Proceedings of the American Academy of Arts and Sciences | Helium does not solidify at a pressure of one atmosphere |
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| Helium can only solidify at pressures above 25 atmospheres, which corresponds to a melting point of absolute zero |