• You know, if you want to measure the potential energy of something in a gravitational field, you have to define the zero somewhere, right, because it's arbitrary. You can set it anywhere you want. It's the same with enthalpy.

    你知道,如果你想测量重力场,中某种东西的势能,你需要,在某处定义一个零点,对吧?,因为势能的值是任意的,你可以把它设定在。

    麻省理工公开课 - 热力学与动力学课程节选

  • So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.

    我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方

    耶鲁公开课 - 基础物理课程节选

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