Obsidian is a kind of black glass formed when the heat of a volcano melts the silica material in sand.

VOA: special.2009.09.16

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

This could be a serious problem. The shield protected the spacecraft from burning up from the extreme heat of re-entering the Earth's atmosphere.

VOA: special.2009.06.17

He was in "On the Waterfront," "In the Heat of the Night," and really bad movies like "Carpool."

他演过“码头风云”“炎热的夜晚”,也演过“乌龙抢匪妙事多”这样的大烂片“

耶鲁公开课 - 心理学导论课程节选

It would leave the atmosphere briefly, then return, testing the effects of the extreme heat of re-entry.

VOA: special.2010.07.07

King Goll is a mythical Irish ruler who goes mad in the heat of battle.

郭尔王是传说中的爱尔兰统治者,他在战斗激烈时发疯了。

耶鲁公开课 - 现代诗歌课程节选

You may think it is just a normal chocolate until you begin to taste the deep and rich heat of these special spices.

VOA: special.2010.02.17

Well, does one feel any nostalgia now for the coolness and heat of this moment?

由于这个时代的冷暖,人们会怀念过去吗？

耶鲁公开课 - 文学理论导论课程节选

But the intense heat of passing through the Earth's atmosphere likely damaged those molecules.

VOA: special.2011.06.22

She's stuck to a -- this is remarkable: she's stuck to a "marble venomed seat smeared with gums of glutinous heat."

这个值得注意，她坚持坐在,涂满胶状树胶的邪恶石头凳子上“

耶鲁公开课 - 弥尔顿课程节选

The radio silence, caused by the heat of re-entry, lasted for seven minutes.

VOA: special.2009.06.17

And it's not hard to see how the heat of reaction at room temperature can be related to they heat of reaction at other temperatures.

知道室温下的反应热,如何与其他温度下的反应,热联系起来这点并不困难。

麻省理工公开课 - 热力学与动力学课程节选

In the heat of the sun, the asphalt softened.

VOA: special.2010.04.07

Real refrigerators actually work with liquids that go into gases so use the latent heat of the liquid, so it doesn't really work like the Joule-Thomson expansion. So this is real.

液体变成气体来工作,以运用液体的潜热，所以这不是,真正像焦耳-汤姆逊膨胀一样工作,这是真实的气体，不像焦耳。

麻省理工公开课 - 热力学与动力学课程节选

Many have cuts and broken bones from falling debris and burns from the intense heat of the explosion.

VOA: standard.2010.07.26

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

The heat of their hands, likely to accelerate the melting process.

VOA: standard.2009.12.13

And all of that is coming out of the heat of reaction, whether it's positive or negative.

所有这些都来源于反应热,它可以是正的或负的。

麻省理工公开课 - 热力学与动力学课程节选

If the problem continues for several days, the effects will be the same as the usual kind of heat exhaustion.

VOA: special.2010.07.27

And our heat of reaction or enthalpy of reaction is defined as the enthalpy at constant pressure.

我们的反应热，或反映,的焓被定义为恒压，等温。

麻省理工公开课 - 热力学与动力学课程节选

I knew the sky was black because all the heat, which meant light to me, had died out of the air.

VOA: special.2009.11.15

This is the negative heat of formation, right?

这里是负的生成热，对吧？

麻省理工公开课 - 热力学与动力学课程节选

The most important weapon against carbon monoxide poisoning is the safe use of materials to heat any enclosed area.

VOA: special.2010.02.02

We can tabulate them. We can know them, and then when we have reactions that inter-convert different compounds, we can calculate the heat of reaction is just the difference between the heat of formation of the reactants, and the heat of formation of the products, right.

种化合物的生成热，可以把它们列成表,可以认知它们，而当我们要处理，在不同化合物间转变的反应时,我们只要计算反应物和,生成物的生成热之间的不同,就能计算出反应热。

麻省理工公开课 - 热力学与动力学课程节选

Heat exhaustion may also produce a feeling of sickness, a fast heartbeat,breathing problems and pain in the head,chest or stomach.

VOA: special.2010.07.27

Now, the coefficient that relates the amount of heat in to the temperature change is obviously going to be different for these two cases.

在这两个例子中,很显然联系热量和温度变化的系数,是不一样的。

麻省理工公开课 - 热力学与动力学课程节选

One reason is that heat from the sun can go through many of the building materials commonly found in cities.

VOA: special.2010.03.02

And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.

在实际中，我们定义,效率为热与功的比值。

麻省理工公开课 - 热力学与动力学课程节选

I didn't even need to know that heat capacity of the product, right. Because it's effect the thermal mass of the product is negligible compared to the thermal mass of the calorimeter.

我甚至不需要知道生成物的,热容是多少，因为生成物的,热质量的作用相比于,量热计的热质量是可以忽略的。

麻省理工公开课 - 热力学与动力学课程节选