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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 Knudsen equation ： ウィキペディア英語版 Knudsen equation In fluid dynamics, the Knudsen equation is used to describe how gas flows through a tube in free molecular flow. When the mean free path of the molecules in the gas is larger than or equal to the diameter of the tube, the molecules will interact more often with the walls of the tube than with each other. For typical tube dimensions, this occurs only in high or ultrahigh vacuum. The equation was developed by Martin Hans Christian Knudsen (1871–1949), a Danish physicist who taught and conducted research at the Technical University of Denmark. ==Cylindrical tube== For a cylindrical tube, the Knudsen equation is: :$q\; =\; \backslash frac16\; \backslash sqrt\; \backslash Delta\; P\; \backslash frac$ For nitrogen (or air) at room temperature, the conductivity $C$ (in liters per second) of a tube can be calculated from this equation: :$\backslash frac\}\; \backslash approx\; 12\; \backslash ,\; \backslash frac\}$ 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「Knudsen equation」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.