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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 Thermal velocity ： ウィキペディア英語版 Thermal velocity The thermal velocity or thermal speed is a typical velocity of the thermal motion of particles which make up a gas, liquid, etc. Thus, indirectly, thermal velocity is a measure of temperature. Technically speaking it is a measure of the width of the peak in the Maxwell–Boltzmann particle velocity distribution. Note that in the strictest sense ''thermal velocity'' is not a velocity, since ''velocity'' usually describes a vector rather than simply a scalar speed. Since the thermal velocity is only a "typical" velocity, a number of different definitions can be and are used. Taking $k\_B$ to be the Boltzmann constant, $T$ is the temperature, and $m$ is the mass of a particle, then we can write the different thermal velocities: == In one dimension == If $v\_$ is defined as the root mean square of the velocity in any one dimension (i.e. any single direction), then :$v\_=\backslash sqrt\}$. If $v\_$ is defined as the mean of the magnitude of the velocity in any one dimension (i.e. any single direction), then :$v\_=\backslash sqrt\}$. If $v\_$ is defined as the $1/e$ half-width of the thermal distribution or if $v\_$ is defined such that a particle with this speed has an energy of $k\_B\; T$, then :$v\_=\backslash sqrt\}$. By all of these definitions $v\_$ falls in the range of :$v\_=(1.1\backslash pm\; 0.3)\backslash sqrt\}$. 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「Thermal velocity」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.