第十三章 第3讲 热力学定律与能量守恒定律
第3讲 热力学定律与能量守恒定律一、热力学第一定律1.改变物体内能的两种方式(1)做功;(2)热传递.2.热力学第一定律(1)内容:一个热力学系统的内能增量等于外界向它传递的热量与外界对它所做功的和.(2)表达式:ΔU=Q+W.(3)ΔU=Q+W中正、负号法则:物理量意义符号WQΔU+外界对物体做功物体吸收热量内能增加-物体对外界做功物体放出热量内能减少自测1 一定质量的理想气体在某一过程中,外界对气体做功7.0×104J,气体内能减少1.3×105J,则此过程( )A.气体从外界吸收热量2.0×105JB.气体向外界放出热量2.0×105JC.气体从外界吸收热量6.0×104JD.气体向外...
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