...However, this method only allows for an approximate estimate of the pressure because the pressure distribution in the gasket that seals the sample is not uniform and there is a large loss of force due to friction. To perform such ultra-high pressure measurements more accurately, a "pressure fixed point" is used. A pressure fixed point takes advantage of the fact that a phase transition between liquid and solid or solid and solid (different crystal structures) of a substance occurs at a constant pressure if the temperature is determined. Fixed point substances and their fixed point values are shown in Table 2. ... *Some of the terminology that refers to "pressure fixed point" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…しかし,この方法では試料を密封するガスケット内の圧力分布が一様でなく,また摩擦による力の損失が大きいため,圧力のおよその値が推定されるに過ぎない。このような超高圧測定をより正確に行うには,〈圧力定点〉が利用される。圧力定点は物質の液体‐固体あるいは固体‐固体(結晶構造が異なる)間の相転移が温度を決めれば一定の圧力で起こることを利用するもので,定点物質とその定点値を表2に示す。… ※「圧力定点」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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