So the work that you're doing to expand, to go through this experiment, ends up cooling the gas.

因此在膨胀气体的过程中,气体降温。

麻省理工公开课 - 热力学与动力学课程节选

All right, so gamma, the gas is cooling so V2 is going to be less than it what would be if the temperature kept constant.

气体温度下降了,于是V2会比等温过程,降到相同压强时的体积要小。

麻省理工公开课 - 热力学与动力学课程节选