第3节 热力学定律与能量守恒定律
第3节热力学定律与能量守恒定律返回返回着眼着眼““四层四层””夯基础夯基础立足立足““四翼四翼””探考点探考点课时跟踪检测课时跟踪检测返回返回着眼着眼“四层”“四层”夯基夯基础础返回返回一、热力学第一定律1．改变物体内能的两种方式(1)______；(2)________。[注1]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______与外界对它所做的功的和。(2)表达式：ΔU＝________。做功热传递热量Q＋W3．ΔU＝W＋Q中正、负号法则物理量WQΔU＋外界对物体做功物体______热量内能______－物体对外界做功物体______热量内能______吸收...
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