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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 Critical radius ： ウィキペディア英語版 Critical radius Critical radius is the minimum size that must be formed by atoms or molecules clustering together (in a gas, liquid or solid matrix) before a new-phase inclusion (a bubble, a droplet, or a solid particle) is stable and begins to grow. Formation of such stable "nuclei" is called nucleation. In precipitation models this is generally a prelude to models of the growth process itself. Sometimes precipitation is rate-limited by the nucleation process. This happens for example before one takes a cup of superheated water from a microwave and, when jiggling it against dust particles on the wall of the cup, enables "heterogeneous" nucleation that then rapidly converts much of that water into steam. If the change in phase forms a crystalline solid in a liquid matrix, the atoms might then form a dendrite. The crystal growth continues in three dimensions, the atoms attaching themselves in certain preferred directions, usually along the axes of a crystal, forming a characteristic tree-like structure of a dendrite. Example: the critical radius for spheric-like dendride in an ideal system can be determined from its Gibbs free energy $G=\backslash frac\; r^3\; G\_v\; +\; 4\; \backslash pi\; r^2\; \backslash gamma$ where $G\_v$ is the Gibbs volume energy and $\backslash gamma$ is the interfacial energy. The critical radius $r\_c$ is found by setting the derivative of $G$ equal to zero $\backslash frac=4\backslash pi\; r\_c^2\; G\_v+\; 8\; \backslash pi\; r\_c\; \backslash gamma\; =\; 0$ yielding $r\_c\; =\; -\backslash frac$, where $\backslash gamma$ is the surface energy, and $G\_v$ is Gibbs energy per volume. ==See also== * Nucleation * Homogeneous nucleation * Heterogeneous nucleation * Ostwald ripening 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「Critical radius」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.