等温等压下，上式可写为 dK=∑(oX)dng ax OnB (1)定义 X XB=)T.P. OnB dX=∑XadnB B=1 88 等温等压下，上式可写为     = B T,P,n n B B ) dn n X dX ( c B T,P,nc n B B B ) n X X (    = (1)定义  = = B 1 dX XB dn B