it's zero. Delta H1 is zero, right.

处于恒压下，它是零。

麻省理工公开课 - 热力学与动力学课程节选

What we're really going to do in practice is we're going to measure, we're going to use our thermometer and say great, how much did the temperature change, right.

H1是零,实际上我们要做的,是用我们的温度计,测量温度改变了多少。

麻省理工公开课 - 热力学与动力学课程节选