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The controversial carbon solid–liquid–vapour triple point


THE controversy over the solid-liquid-vapour (S–L–V) triple point of carbon began in 1849 (ref. 1). Since then, investigators have developed widely differing points of view which are discussed here. Some believe the triple-point pressure is 105 Pa (1 atm), whereas others believe it is 107 Pa (100 atm). Over the past 40 yr, the 107 Pa view has dominated but the evidence is not entirely convincing. In the past few years, new evidence has been obtained that apparently ends the controversy at least from the standpoint of the proper order of magnitude of the pressure.

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WHITTAKER, A. The controversial carbon solid–liquid–vapour triple point. Nature 276, 695–696 (1978).

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