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Science 9 March 1979:
Vol. 203. no. 4384, pp. 1004 - 1006
DOI: 10.1126/science.203.4384.1004
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Articles

Observations of Hydrogen at Room Temperature (25°C) and High Pressure (to 500 Kilobars)

H. K. MAO 1 and P. M. BELL 1

1 Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008

Hydrogen becomes a solid at 25°C when subjected to a pressure of 57 kilobars. The high-pressure phase appears as a transparent crystalline mass. The refractive index of the high-pressure phase increases sharply with pressure, indicating a density increase of similar magnitude. At 360 kilobars the calculated density of the high-pressure phase is 0.6 to 0.7 grams per cubic centimeter.

Submitted on January 30, 1979


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