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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 Acentric factor ： ウィキペディア英語版 Acentric factor The ''acentric'' factor $\backslash omega$ is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be very useful in the description of matter. It has become a standard for the phase characterization of single & pure components. The other state description parameters are molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility).The acentric factor is said to be a measure of the non-sphericity (centricity) of molecules. As it increases, the vapor curve is "pulled" down, resulting in higher boiling points. It is defined as: :$\backslash omega\; =\; -\; \backslash log\_\; (p^\; T\_r\; =\; 0.7$. where $T\_r\; =\; \backslash frac$ is the reduced temperature, $p^\}\}$ is the reduced pressure saturation of vapors. For many monatomic fluids :$p\_r^\; T\_r\; =\; 0.7$, is close to 0.1, therefore $\backslash omega\; \backslash to\; 0$. In many cases, $T\_r\; =\; 0.7$ lies above the boiling temperature of gases at atmosphere pressure. Values of $\backslash omega$ can be determined for any fluid from $\backslash$, and a vapor measurement from $T\_r\; =\; 0.7$, and for many liquid state matter is tabulated into many thermodynamical tables. The definition of $\backslash omega$ gives zero-value for the noble gases argon, krypton, and xenon. $\backslash omega$ is almost exactly zero for other spherical molecules.〔 Experimental data yields compressibility factors for all fluids that are correlated by the same curves when $Z$ (compressibility factor) is represented as a function of $T\_r$ and $p\_r$. This is the basis premises of three-parameter theorem of corresponding states: All fluids at any $\backslash omega$-value, in $\backslash =const.$ conditions, have about the same $Z$-value, and same degree of convergence. ==Values of some common gases== 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「Acentric factor」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.