物理学 13-6热力学第二定律的表述卡诺定理 第五版 热力学第二定律的两种表述表明 (Two statements of second law of thermodynamics) 在自然界中,热量的传递和热功之间的转换 都是有方向性的,这个方向性是:在一个孤立系 统中,热量只能自动地从高温物体传递的低温物 体,而不能相反进行;在一个循环过程中,功能 全部转变为热,而热不能全部转变为功。 In nature there is directionality in both the transport heat the conversion between heat work, The directionality is: In an isolated system, heat can only spontaneously flow from a high temperature objects to a low temperature objects, but not the other way around, in a cyclic process work can totally be converted into heat, but heat can not be totally converted into work 第十三章热力学基础 6/2013-6 热力学第二定律的表述 卡诺定理 第十三章 热力学基础 物理学 第五版 6/20 在自然界中，热量的传递和热功之间的转换 都是有方向性的，这个方向性是：在一个孤立系 统中，热量只能自动地从高温物体传递的低温物 体，而不能相反进行；在一个循环过程中，功能 全部转变为热，而热不能全部转变为功。 In nature there is directionality in both the transport heat & the conversion between heat & work, The directionality is: In an isolated system, heat can only spontaneously flow from a high temperature objects to a low temperature objects, but not the other way around, in a cyclic process work can totally be converted into heat ,but heat can not be totally converted into work 热力学第二定律的两种表述表明 (Two statements of Second law of thermodynamics)