让我们考虑如下两个例子: a pressure vessel containing stagnant air at 10 atm. 压力为10atm的贮存静止气体的压力罐。) 2. A supersonic flow at m=2.16 and p=l atm (来流马赫数为M=216,静压为1atm的超音速流。) In case 1, P0=10atm In case bMp=(1+2263y5mn 2 ≈Iatm让我们考虑如下两个例子： 1. A pressure vessel containing stagnant air at 10 atm. ( 一压力为10atm的贮存静止气体的压力罐。) 2. A supersonic flow at M=2.16 and p=1 atm (来流马赫数为M=2.16，静压为1atm的超音速流。) In case 1, =10atm, In case 2, 0 p 10atm ) (1 .2 2.16 ) 1atm 2 1 (1 2 ( 1) 2 3.5 0  = + • • − = + − p M p   