U and in the throttling process adiabatic 2 =0, then U7,-U1=△=W Left, Surroundings compresses gaseous system work, system got P1△=P1(△=0-1=-1) Right gaseous system expansion: work surr got 2=-P2△=-P2V2(△V=12-0=12) 4上一内容下一内容◆回主目录 返回 2021/2/22上一内容 下一内容 回主目录 返回 2021/2/22 U and H in the throttling process W p V 1 1 = −  Left, Surroundings compresses gaseous system: work, system got： Adiabatic Q=0 ，then： U U U W 2 1 − =  = Right, gaseous system expansion： work , surr. got: W p V 2 2 = −  1 1 1 1 =  − = − pV V V V ( =0 ) 2 2 2 2 = −  − = p V V V V ( = 0 )