翻訳と辞書 Words near each other ・ Internal Exile ・ Internal Exile (Fish album) ・ Internal Exile (Los Illegals) ・ Internal Family Systems Model ・ Internal fan-cooled electric motor ・ Internal fertilization ・ Internal field separator ・ Internal financing ・ Internal Fire – Museum of Power ・ Internal fixation ・ Internal flow ・ Internal focusing ・ Internal forum ・ Internal gangrene ・ Internal hard-drive defect management ・ Internal heating ・ Internal hernia ・ Internal history ・ Internal iliac ・ Internal iliac artery ・ Internal iliac lymph nodes ・ Internal iliac vein ・ Internal iliac vessels ・ Internal improvements ・ Internal intercostal muscles ・ Internal jugular vein ・ Internal labor market ・ Internal laryngeal nerve ・ Internal link ・ Internal loop 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 Internal heating ： ウィキペディア英語版 Internal heating Internal heat is the heat source from the interior of celestial objects, such as stars, brown dwarfs, planets, moons, dwarf planets, and (in the early history of the Solar system) even asteroids such as Vesta, resulting from contraction caused by gravity (the Kelvin–Helmholtz mechanism), nuclear fusion, tidal heating, core solidification (heat of fusion released as molten core material solidifies), and radioactive decay. The amount of internal heating depends on mass; the more massive the object, the more internal heat it has; also, for a given density, the more massive the object, the greater the ratio of mass to surface area, and thus the greater the retention of internal heat. The internal heating keeps celestial objects warm and active. == Small celestial objects == In the early history of the Solar system, radioactive isotopes having a half-life on the order of a few million years (such as aluminium-26 and iron-60) were sufficiently abundant to produce enough heat to cause internal melting of some moons and even some asteroids, such as Vesta noted above. After these radioactive isotopes had decayed to insignificant levels, the heat generated by longer-lived radioactive isotopes (such as potassium-40, thorium-232, and uranium-235 and uranium-238) was insufficient to keep these bodies molten unless they had an alternative source of internal heating, such as tidal heating. Thus, Earth's Moon, which has no alternative source of internal heating is now geologically dead, whereas a moon as small as Enceladus that has sufficient tidal heating (or at least had it recently) and some remaining radioactive heating, is able to maintain an active and directly detectable cryovolcanism. 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「Internal heating」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.