T (7.6a) h=c T (7.6b) (76b)-(76a) C R (7.7) 定义比热比 y R I R (78) R (7.10) y y(7.6b) (7.6a) h c T e c T p v = = (7.6b)-(7.6a): c p − cv = R (7.7) 定义比热比 v p c c  = 1 (7.8) p p v c R c c − = 1 1 p c R − =  −1 =  R c p −1 =  R cv (7.９) (7.１０)