To ask questions like how much heat is released in a chemical reaction that takes place at constant temperature.

当我们想要知道,当一个化学反应在恒定的温度下发生时,会放出多少热量时。

麻省理工公开课 - 热力学与动力学课程节选

a You know that what will happen is that heat will flow from a to b from b to c and from a to c. That's common-sense.

你知道会发生的是热量从流向,从流向,以及从流向。

麻省理工公开课 - 热力学与动力学课程节选

They've been very important political players now in the trying to get rid of trans fats in restaurant movement and also the movement that's happening around the country to try to get calories put on menus in restaurants.

现在它们的重要政治地位体现在,现在餐饮业中进行的反对反式脂肪运动中,和全国范围发生的要求,在菜单上注明食品热量的运动中

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, you need some sort of property, something you can see, something you can measure, that tells you that heat has flowed.

所以，你需要某种性质，某种你能看到，能测量的东西，它会告诉你热量发生了流动。

麻省理工公开课 - 热力学与动力学课程节选

The boundary is impervious to transfer of heat like a thermos Anything that happens inside of the thermos is an adiabatic change because the thermos has no connection in terms of energy to the outside world.

边界不能传递热量,像热水瓶一样,热水瓶里发生的任何事,都是绝热变化,因为热水瓶与外部世界,没有能量方面的联系。

麻省理工公开课 - 热力学与动力学课程节选

It's just how much heat is involved when we change the temperature. Now, the products have some heat capacity associated with them right, it takes a certain amount of heat if we make their temperature change, to either put it in or take it away, depending on which direction the temperature is changing.

问题就是当我们改变温度时,有多少热量发生了转移,生成物具有一定的热容,如果我们改变,它们的温度，就要输入或,提取一定的热量,这取决于温度改变的方向。

麻省理工公开课 - 热力学与动力学课程节选