It's an isothermal change.

这是恒温的变化。

youdao

PROFESSOR BAWENDI: so, for an ideal gas, the isothermal is the easy one because the energy doesn't change.

对理想气体，等温过程最简单，因为能量不变。

youdao

The result of experiment has shown that the infrared radiation energy of rock changes obviously with pressure change under the condition of isothermal process loading.

在等温过程加载的条件下，实验得出岩石的红外辐射能量随压力变化显著变化的结果。

youdao

PROFESSOR BAWENDI: So the question was, for an isothermal expansion, delta u does not change, therefore, The answer is that's true only for an ideal gas.

你的问题是，在等温过程中，内能是否，这只对理想气体成立。

麻省理工公开课 - 热力学与动力学课程节选

For isothermal expansion, that means that delta u does not change, but delta q is equal to delta w?

在等温过程中，是不是内能不变，Δq等于Δw？

麻省理工公开课 - 热力学与动力学课程节选

PROFESSOR BAWENDI: So, for an ideal gas, the isothermal is the easy one because the energy doesn't change.

对理想气体，等温过程最简单,因为能量不变。

麻省理工公开课 - 热力学与动力学课程节选