• You take a throttle valve, which consists of some sort of porous plug between two cylinders that is insulated. There is insulation here.

    有一个节流阀,它由一些多孔的塞子组成,这些多孔塞在两个绝热的汽缸之中,这里是绝热的,底下也是绝热的。

    麻省理工公开课 - 热力学与动力学课程节选

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