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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 Equation of state (cosmology) ： ウィキペディア英語版 Equation of state (cosmology) In cosmology, the equation of state of a perfect fluid is characterized by a dimensionless number $\backslash !\; w$, equal to the ratio of its pressure $\backslash !\; p$ to its energy density $\backslash !\; \backslash rho$: :$\backslash !\; w=p/\backslash rho$. It is closely related to the thermodynamic equation of state and ideal gas law. ==The equation== The perfect gas equation of state may be written as :$\backslash !\; p\; =\; \backslash rho\_m\; RT\; =\; \backslash rho\_m\; C^2$ where $\backslash !\; \backslash rho\_m$ is the mass density, $\backslash !\; R$ is the particular gas constant, $\backslash !\; T$ is the temperature and $\backslash !\; C=\backslash sqrt$ is a characteristic thermal speed of the molecules. Thus :$w\; =\; \backslash frac\; =\; \backslash frac\; =\; \backslash frac\backslash approx\; 0$ where $\backslash !\; \backslash rho\; =\; \backslash rho\_mc^2$ and 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「Equation of state (cosmology)」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.