You could run the reaction, take solid iron and gaseous oxygen, form iron oxide, measure the heat of formation of it, and tabulate it.

你可以进行一个反应，用固态铁和氧气生成氧化铁，测量它生成的热，列成表格。

youdao

Here I'm going to put together all the products. So this is a positive heat of formation.

这里，我要把元素组合成所有这些，生成物，所以这里是正的生成热。

youdao

This is the negative heat of formation, right?

这里是负的生成热，对吧？

youdao

You could run the reaction, take solid iron gaseous oxygen, form iron oxide, measure the heat of formation of it, tabulate it.

你可以进行一个反应,用固态铁和氧气生成氧化铁，测量它的生成热，列成表格。

麻省理工公开课 - 热力学与动力学课程节选

But this is a compound, right, it has some non-zero heat of formation from the elements. So is water, right?

但这是种化合物，对吧？,它具有非零的生成热,水也是一样，对吧？

麻省理工公开课 - 热力学与动力学课程节选

So we're just subtracting, in effect, zero, right, from the enthalpy of the product, but of course it's important have that established because the heat of formation is something you could measure, right?

所以从效果上说，我们只是，从生成物的焓中减去了零，但，是确立这一点很重要,因为生成热是,你能测量的东西，对吧？

麻省理工公开课 - 热力学与动力学课程节选

However Christian Marois, of the NRC Herzberg Institute of Astrophysics in Canada and his colleagues, developed a computer processing technique that was able to separate the light from HR 8799 from the light the planets are emitting they are still so young that they are glowing from heat left over from their formation about 60m years ago.

ECONOMIST: Planets are seen outside the Solar System

These treatments heat the dermis and cause new collagen and elastin formation.

CNN: Wrinkles