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热力学第二定律 - Wikipedia

热力学第二定律

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1824年法国工程师萨迪·卡诺(Sadi Carnot)提出了卡诺定理,德国人克劳修斯(Rudolph Clausius)和法国人开尔文(Lord Kelvin)在热力学第一定律建立以后重新审查了卡诺定理,意识到卡诺定理必须依据一个新的定理,即热力学第二定律。他们分别于1850年1851年提出了克劳修斯表述和开尔文表述。这两种解決在理念上是相通的。

[编辑] 克劳修斯表述

不可能把热量从低温物体传到高温物体而不引起其他变化。簡言之即是熱不能自发的從冷處轉到热處,任何高溫的物體在不受熱的情況下,都會逐漸冷卻。

[编辑] 开尔文表述

不可能从单一热源吸取热量,使之完全变为有用功而不产生其他影响。

开尔文表述还可以表述成:第二类永动机不可能造成。

永動機是不需外界輸入源、能量便能夠不斷運動的機械。因為熱的本質乃粒子運動時所產生的能量,換言之,沒有外界輸入能源、能量,粒子最終都會慢慢的停頓下來,繼而不再產生熱能。

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