In addition to this normal structure of ice, several types of ice with higher densities and different crystal shapes are formed under high pressure. When gases such as chlorine, methane, and propane are cooled with water under high pressure, gas hydrates such as Cl 2 ・7.7H 2 O, CH 4 ・5.7H 2 O, and C 3 H 8 ・17H 2 O are formed. In these, the water molecules form a birdcage-like structure through hydrogen bonds, trapping the gas molecules inside. This is a type of clathrate compound. *Some of the terminology explanations that mention "gas hydrate" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このような通常の構造の氷のほか,高圧下では密度がさらに大きく,結晶形の異なる数種の氷が生ずる。また塩素,メタン,プロパンなどの気体が高圧下で水とともに冷却されると,Cl2・7.7H2O,CH4・5.7H2O,C3H8・17H2Oのような〈気体水和物〉ができるが,これらの中では水分子が水素結合によって鳥かご状の構造をつくり,気体分子をその中に取りこんでいる。これはクラスレート化合物の一種である。… ※「気体水和物」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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