即恒定体积，改变温度，这里恒定温度下。

Then we can take the derivative of that quantity, when we vary the temperature, holding the volume constant.

youdao

放射性物质容器弹和水槽组成的封闭体系具有恒定体积，而且是绝热的。

The closed system of bomb plus water bath has a constant volume and is thermally insulated.

youdao

我们有一个密封的反应容器，它的体积是恒定的。

We'll have a reaction vessel that's sealed, it's constant volume.

youdao

On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.

另一方面，温度，体积和压强,在实验室中比较容易保持恒定。

麻省理工公开课 - 热力学与动力学课程节选

Now, you know with constant volume, H now it's not going to be delta H that's U straightforward to measure, it's going to be dealt u, all right.

好，现在你们知道在体积恒定的条件下，我们得到的不是Δ,我们直接测量到的是Δ,好，但这基本上也是一样的。

麻省理工公开课 - 热力学与动力学课程节选

Then we can take the derivative of that quantity, when we vary the temperature, holding the volume constant.

即恒定体积，改变温度，这里恒定温度下。

麻省理工公开课 - 热力学与动力学课程节选