Ⅲ二次膨胀 V=ldm '2=l0dm3 P-0.sp' aP=051A0p0 v-2dm W1=P'(V’-V)=0.5P(2-1)=0.5P9 W2=P2(V2-V')=0.1P9（10-2)=0.8P9 Wm-W1+W2=1.3P9=1.3×105Pa·dm3=130J 3 Ⅲ二次膨胀       = = 3 1 1 1 , , V d m n T P P        = = 3 2 2 10 , , 0.1 V d m n T P P  1 PSurr 0.5P ,W  = 2 PSurr 0.1P ,W  =       = = 3 ` 2 , , ` 0.5 V d m n T P P  W1 =P'(V'-V1 )=0.5Pθ（2-1）=0.5Pθ W2 =P2 (V2 -V')=0.1Pθ（10-2）=0.8Pθ WⅢ=W1 +W2 =1.3 Pθ=1.3×105 Pa·dm3 =130J