817-4 The First Law of Thermodynamics(407-408 重点 1. Work of Ouasi-Steady Process 由功的定义: dw= Fdl= pSdl dw= pdv pd 在P~图中曲线下的面积 Work is path-dependent quantity(p411) 功是过程量§17-4 The First Law of Thermodynamics (407-408) 重点 由功的定义： dW = Fdl = pSdl dW = pdV  = 2 1 d V V W p V 1. Work of Quasi-Steady Process 在P~V图中曲线下的面积 Work is path-dependent quantity (p411) 功是过程量