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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 sphericity ： ウィキペディア英語版 sphericity Sphericity is a measure of how spherical (round) an object is. As such, it is a specific example of a compactness measure of a shape. Defined by Wadell in 1935, the sphericity, $\backslash Psi$, of a particle is: the ratio of the surface area of a sphere (with the same volume as the given particle) to the surface area of the particle: :$\backslash Psi\; =\; \backslash frac\}(6V\_p)^\}\}$ where $V\_p$ is volume of the particle and $A\_p$ is the surface area of the particle. The sphericity of a sphere is unity by definition and, by the isoperimetric inequality, any particle which is not a sphere will have sphericity less than 1. == Ellipsoidal objects == The sphericity, $\backslash Psi$, of an oblate spheroid (similar to the shape of the planet Earth) is: :$\backslash Psi\; =$ \frac}(6V_p)^}} = \frac}b\right)}}, where ''a'' and ''b'' are the semi-major and semi-minor axes respectively. 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「sphericity」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.