五、w,w和q 定容过程 w=pi=0=-∫广p=v(p-p) g,Au+w=Au=cr}(T-T)=f"Tds 定压过程 w=p(2-) 化，=0 9p =Nh+w.=Ah=cp(T:-T)=f"Tds
11 五、w, wt 和 q 定容过程 2 1 w p v = = d 0 定压过程 ( ) 2 1 w= p v −v ( ) 2 t 1 2 1 w v p v p p = − = − d ( ) 2 1 2 2 1 1 d T v V T q u w u c T T T s = + = = − = t w = 0 ( ) 2 1 2 t 2 1 1 d T p p T q h w h c T T T s = + = = − =
定温过程 w=pdw=∫2p'dv=Rg V g=-gr=-Rgh会 q=△u+w=△h+w:→q=w=1W 12
12 定温过程 2 2 2 g 1 1 1 1 d d ln pv v w p v v R T v v = = = 2 2 2 t g 1 1 1 1 d d ln vp p w v p v R T p p = − = − = − t q u w h w = + = + t = = q w w