翻訳と辞書 Words near each other ・ Thermal response test ・ Thermal rocket ・ Thermal runaway ・ Thermal scanning probe lithography ・ Thermal science ・ Thermal shift assay ・ Thermal shock ・ Thermal simulations for integrated circuits ・ Thermal sleeve ・ Thermal spraying ・ Thermal stability ・ Thermal subsidence ・ Thermal tails ・ Thermal time ・ Thermal time hypothesis ・ Thermal time scale ・ Thermal transfer ・ Thermal transfer printing ・ Thermal transmittance ・ Thermal transpiration ・ Thermal trauma ・ Thermal treatment ・ Thermal vacuum chamber ・ Thermal velocity ・ Thermal weapon sight ・ Thermal wheel ・ Thermal wind ・ Thermal work limit ・ Thermal, California ・ Thermal, Fresno County, California 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 Thermal time scale ： ウィキペディア英語版 Thermal time scale In astrophysics, the thermal time scale or Kelvin-Helmholtz time scale is the approximate time it takes for a star to radiate away its total kinetic energy content at its current luminosity rate. Along with the nuclear and dynamical time scales, it is used to estimate the length of time a particular star will remain in a certain phase of its life and its lifespan if hypothetical conditions are met. In reality, the lifespan of a star is greater than what is estimated by the thermal time scale because as one fuel becomes scarce, another will generally take its place--hydrogen burning gives way to helium burning, which is replaced by carbon burning. ==Stellar astrophysics== The size of a star as well as its energy output generally determine a star's thermal lifetime because the measurement is independent of the type of fuel normally found at its center. Indeed, the thermal time scale assumes that there is no fuel at all inside the star and simply predicts the length of time it would take for the resulting change in outputted energy to reach the surface of the star and become visually apparent to an outside observer. $\backslash tau\_\; =\; \backslash frac\}\; =\; \backslash cfrac$ where G is the gravitational constant, M is the mass of the star, R is the radius of the star, and L is the star's luminosity. As an example, the Sun's thermal time scale is approximately 30 million years. 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 time scale」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.