把此薄壳箱固定于平桌车上，操作者沿着两个气球中心连线的方向加速推动平桌车，两个气球将在等效引力和惯性力的共同作用下作相向或相离加速运动.

了解本实验，将使学生对气体热平衡态的概念、对等效原理、对惯性力以及对在非惯性系中处理问题的理解有所帮助.

one floated up and the heavy one sunk. They are tied by a filament to fix on the upper and lower

shell walls，so that the central heights of the two balloons are roughly equal. The thin shell

box is fixed on a flat table car. The flat table car is pushed to accelerate along the direction of the connecting line between their centers and they can

make opposite or separated acceleration motion under the joint action of equivalent gravity

and inertial force. This experiment can help students to understand the concept of gas heat

balance，equivalent principle，inertial force and handling prob- lems in non-inertial system.