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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Entropy of fusion ： ウィキペディア英語版 Entropy of fusion The entropy of fusion is the increase in entropy when melting a substance. This is almost always positive since the degree of disorder increases in the transition from an organized crystalline solid to the disorganized structure of a liquid; the only known exception is helium. It is denoted as ΔSfus and normally expressed in J mol−1 K−1 A natural process such as a phase transition will occur when the associated change in the Gibbs free energy is negative. :, where $\backslash Delta\; H\_$ is the enthalpy or heat of fusion. Since this is a thermodynamic equation, the symbol T refers to the absolute thermodynamic temperature, measured in Kelvin (K). Equilibrium occurs when the temperature is equal to the melting point $T\; =\; T\_f$ so that :$\backslash Delta\; G\_\; =\; \backslash Delta\; H\_\; -\; T\_f\; \backslash times\; \backslash Delta\; S\_\; =\; 0$, and the entropy of fusion is the heat of fusion divided by the melting point. : $\backslash Delta\; S\_\; =\; \backslash frac$ ==Helium== Helium-3 has a negative entropy of fusion at temperatures below 0.3 K. Helium-4 also has a very slightly negative entropy of fusion below 0.8 K. This means that, at appropriate constant pressures, these substances freeze with the addition of heat. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Entropy of fusion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.