物理化学电子教案第3章(中)(添) 热学能巴 不可能把热从低温 物体传到高温物体 而不引起其它变化 The Secons as of hiearmmodsymatmics 4上一内容下一内容令回主目录 返回 2021/223
上一内容 下一内容 回主目录 返回 2021/2/23 不可能把热从低温 物体传到高温物体， 而不引起其它变化 物理化学电子教案第3章（中）（添）
3.7热力学第二定律的本质和熵的统计意义 气体混合过程的不可逆性 将N2和O2放在一盒内隔板的两边,抽去隔板, N2和O2自动混合,直至平衡。 这是混乱度增加的过程,也是熵增加的过程, 是自发的过程,其逆过程决不会自动发生。 4上一内容下一内容◇回主目录 返回 2021/223
上一内容 下一内容 回主目录 返回 2021/2/23 3.7 热力学第二定律的本质和熵的统计意义 气体混合过程的不可逆性 将N2和O2放在一盒内隔板的两边，抽去隔板， N2和O2自动混合，直至平衡。 这是混乱度增加的过程，也是熵增加的过程， 是自发的过程，其逆过程决不会自动发生
3.8 Concentrating on the system Entropy is the basic concept for discussing the direction of natural changes. Nevertheless, in order to use it we have to investigate both the system and its surroundings. We have seen that it is always very simple to calculate the entropy change in the surroundings and now we shall show that it is possible to devise a method of taking the surroundings into account automatically 4上一内容下一内容◇回主目录 返回 2021/223
上一内容 下一内容 回主目录 返回 2021/2/23 3.8 Concentrating on the system Entropy is the basic concept for discussing the direction of natural changes. Nevertheless, in order to use it we have to investigate both the system and its surroundings. We have seen that it is always very simple to calculate the entropy change in the surroundings, and now we shall show that it is possible to devise a method of taking the surroundings into account automatically
This focuses attention on the system and simplifies thermodynamic discussions Consider a system in thermal equilibrium with its surroundings(so that T Sys=T surT then the clausius inequality reads Sys sys ≥0 T The importance of this inequality is that 4上一内容下一内容令回主目录 返回 2021/223
上一内容 下一内容 回主目录 返回 2021/2/23 This focuses attention on the system, and simplifies thermodynamic discussions. Consider a system in thermal equilibrium with its surroundings(so that ), sys surr T = T then the Clausius inequality reads 0 − T Q dS sys sys The importance of this inequality is that
it expresses the criterion for natural, spontaneous change solely in terms of the properties of the system From now on the superscript denoting the system will be dropped, and everything we do will relate to the system The last equation can be developed in two ways 4上一内容下一内容◇回主目录 返回 2021/223
上一内容 下一内容 回主目录 返回 2021/2/23 it expresses the criterion for natural,spontaneous change solely in terms of the properties of the system. From now on the superscript denoting the system will be dropped, and everything we do will relate to the system. The last equation can be developed in two ways