-
The causes of heat stress include wearing heavy clothing, physical work or exercise, hot weather and high humidity.
VOA: special.2011.08.09
-
We're going to find other properties that do care about the history of the system like work, that you put in the system, or heat that you put in the system, or some other variables But you can't use those to define the equilibrium state.
我们还会发现其他一些,与系统的历史有关的性质,比如你对系统做的功，或者你向系统传递的热量，或其他的变量,但你不能用它们,来定义平衡态。
-
What's happening there? Well, the selection of reactants has been done judiciously to provide either heat or to provide something that's cool.
就会感到这东西，比如说变冷了，对吧？,这里发生了什么？这些反应物都是,被仔细的选出来的，能够提供热量或制冷。
-
So keep the garden watered. Moist soil absorbs more heat than loose,dry soil covered with mulch or vegetation.
VOA: special.2010.01.12
-
You could imagine the dualist coming back and saying, "Look, in the case of the heat-seeking missile or the robot for that matter, although it's doing things, it's just obeying orders.
你可以假想二元论反驳说,在热追踪导弹,或是机器人的例子里,尽管他们各尽其职,但也只是恪守命令
-
Now heat the dye for about forty-five minutes or until the wool is the desired color.
VOA: special.2010.08.02
-
All right, so this is the heat flowing in or out of the system, and these are all functions of state.
好的，这就是系统的热量变化,这些都是态函数。
-
Any new heat or fire could cause the leaking well and the surrounding area to explode.
VOA: special.2009.03.22
-
Adiabatic means there's no heat transferred in or out of the system.
绝热意味着系统,与化境没有热交换。
-
For example,it says putting heat or ice on your head or neck can help.
VOA: special.2010.03.30
-
get back to the initial point is going to require some input from outside, like heat or extra work or extra heat or something because you've done an irreversible process.
如果要逆转它,回到初始点，就需要外界的投入，比如额外的功，额外的热量等等,因为你进行了一个不可逆过程。
-
And it's for that whole unit that you've got some heat capacity. How much heat does it take the warm the entire thing up or the insides of the thing up by a degree? It's that number right.
由这个单位你能知道,一些热容的信息，要让这整个装置,或里面放置的东西,升温一度需要多少热量？
-
It either had work, got its heat from the surroundings, or it got worked on by the surroundings.
系统从环境中，得到热量。
-
All the energy that is inserted into this, which might be turbulence initially, becomes heat, or becomes -- it raises the temperature.
由振动引起的所有，进入系统的能量最后都变成了热，因此温度便升高了。
-
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。
-
I don't want to have to deal with heat escaping to the outside environment in a way that might be difficult or complicated to measure or calculate.
我可不想处理跑到,环境中去的热量，那测量或,计算起来会非常麻烦和复杂。
-
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。
-
for instance, for the thermos with the coffee in if you place the boundary in the inside wall of the glass or the outside wall of the glass and the inside of the thermos, that makes a difference; different heat capacity, etcetera.
比如说，对于装咖啡的热水瓶来说,你把边界设置在瓶胆的内壁上,或者设置在瓶胆外壁上,或设在热水瓶里面，情况都是不一样的;,有不同的热容等等。
-
Or there was a relationship between work and heat.
或者功和热之间有某种联系。
-
And these verbal descriptions lead to some pictures that I put up and I'll put up again about how you might try to accomplish something like run an engine or move heat from a colder to a warmer body.
这些言语的描述有助于你们理解我讲过的,而且还要再讲的一些物理图像,比如一台发动机,是怎么运行的,或热怎样从冷的物体传到热的物体。
-
So you know, what the second law is doing, in other words, it's putting these restrictions on how well or how effectively we can convert heat into work in the case of the engine, or work into heat extracted in the case of a refrigerator.
你们知道，在热机中，热力学第二定律的作用，换句话说，就是给热量,转化为功的效率,施加限制,或在制冷剂中，对抽取热量,进行限制。
-
So we'd really like to be able to find some sort of equation of state, or some sort of rather function of state that's going to relate the heat going in or out of the system with that function of state, because this isn't going to do it.
所以我们真的想要去,找到一些态方程或者态函数,通过这个态函数可以表示热量,在系统与外界的交换,因为这个不能表示它。
-
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。
-
10kJ/K That's the heat released, divided by minus 10 or 10 kilojoules per Kelvin, right. It's 8.2 Kelvin.
再除以-10，或,这就是8。2K，换句话说。
-
It's well insulated. Heat is not going in or out adiabatic. q is equal to zero.
绝热性很好，热量不会变化,是绝热的，Q等于零。
-
And because there is an explicit relationship between u, delta u, q and w, you can always find the easy way to derive the change in internal energy or the heat or the work.
因为Δu，q和w之间,有明确的关系，一般来说,内能或热或功的变化,易于计算。
-
Or I could have a non-adiabatic, I could take the same temperature change, by taking a flame, or a heat source and heating up my substance. So, clearly q is going to depend on the path.
也能改变温度，绝热指的是没有热传递，在非绝热条件下，也同样可以升温,比如用火或者热源加热，这样，q也应当与路径有关。
应用推荐