For example, the electric field or gravitational field is given by the gradient of the gravitational or electric potential.

例如由重力势梯度给出的重力场，或由电势梯度给出的电场。

youdao

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.

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？

youdao

Consequent differential form and integral form of gravitational potential are deduced from the two laws of gravitational field.

根据引力场的两个定理，导出了引力势的微分和积分形式。

youdao

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