The thermos, with the lid on top, It's not a open system your coffee is going to stay warm or hot in the thermos.

顶部盖了盖子的热水瓶，不是开系,你希望你的咖啡在热水瓶里面保持温暖,或滚烫。

麻省理工公开课 - 热力学与动力学课程节选

I am the system. I could be a system It could be a hot coffee in a thermos.

我就是系统，我可以是个系统,它可以是热水瓶里的热咖啡。

麻省理工公开课 - 热力学与动力学课程节选

The boundary is impervious to transfer of heat like a thermos Anything that happens inside of the thermos is an adiabatic change because the thermos has no connection in terms of energy to the outside world.

边界不能传递热量,像热水瓶一样,热水瓶里发生的任何事,都是绝热变化,因为热水瓶与外部世界,没有能量方面的联系。

麻省理工公开课 - 热力学与动力学课程节选

for instance, for the thermos with the coffee in if you place the boundary in the inside wall of the glass or the outside wall of the glass and the inside of the thermos, that makes a difference; different heat capacity, etcetera.

比如说，对于装咖啡的热水瓶来说,你把边界设置在瓶胆的内壁上,或者设置在瓶胆外壁上,或设在热水瓶里面，情况都是不一样的;,有不同的热容等等。

麻省理工公开课 - 热力学与动力学课程节选

There's no heat that can go through the walls of the thermos.

没有热量能,穿过热水瓶的瓶壁。

麻省理工公开课 - 热力学与动力学课程节选

So the thermos is not an open system.

因此热水瓶不是个开系。

麻省理工公开课 - 热力学与动力学课程节选