That's the work that the system is doing to the environment. I'm doing work to the environment. The work is negative, which means that work is being done to the environment.

功的大小,就是矩形的面积,这样我们就实现了一台热机，冷却，加热，加热,冷却，系统回到了初态。

麻省理工公开课 - 热力学与动力学课程节选

Let's divide it up into the two sides, the work going on on the left hand side, my left hand side or your left hand side, and the work going on on the right hand side.

仅仅是功的大小而已，让我们把它分成两部分，左手边功的变化，和右手边功的变化。

麻省理工公开课 - 热力学与动力学课程节选

OK, so let's go through this and see what we would do which is to calculate the heat and the work. This is well insulated.

好的，让我们开始然后看看,我们该怎样计算热量和功的大小,这是完全绝热的，所以。

麻省理工公开课 - 热力学与动力学课程节选