翻訳と辞書 Words near each other ・ Knud V. Engelhardt ・ Knud Vad Thomsen ・ Knud Vermehren ・ Knud Vesterskov ・ Knud W. Jensen ・ Knud Wefald ・ Knud, Hereditary Prince of Denmark ・ Knudsen ・ Knudsen Cell ・ Knudsen diffusion ・ Knudsen equation ・ Knudsen flow ・ Knudsen force ・ Knudsen gas ・ Knudsen layer ・ Knudsen number ・ Knudsen pump ・ Knudsen's First Cabinet ・ Knudson ・ Knudson hypothesis ・ Knudtzon ・ Knudåge Riisager ・ KNUE ・ Knuessl Building ・ Knuffle Bunny ・ Knuffle Bunny Free ・ Knuffle Bunny Too ・ Knugen Faller ・ KNUI ・ KNUJ Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Knudsen number ： ウィキペディア英語版 Knudsen number The Knudsen number (Kn) is a dimensionless number defined as the ratio of the molecular mean free path length to a representative physical length scale. This length scale could be, for example, the radius of a body in a fluid. The number is named after Danish physicist Martin Knudsen (1871–1949). ==Definition== The Knudsen number is a dimensionless number defined as: :$\backslash mathrm\; =\; \backslash frac$ where * $\backslash lambda$ = mean free path () * $L$ = representative physical length scale (). For a Boltzmann gas, the mean free path may be readily calculated so that: :$\backslash mathrm\; =\; \backslash frac$ where * $k\_B$ is the Boltzmann constant (1.3806504(24) × 10−23 J/K in SI units), (L2 T−2 θ−1 ) * $T$ is the thermodynamic temperature, () * $d$ is the particle hard shell diameter, () * $p$ is the total pressure, (L−1 T−2 ). For particle dynamics in the atmosphere, and assuming standard temperature and pressure, i.e. 25 °C and 1 atm, we have $\backslash lambda$ ≈ 8 × 10−8 m. 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 number」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.