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dT/dp is mu JT. So for a real gas like air, this is a positive number. It's not zero.
所以对于像空气这样的真实气体，这是一个正数，不等于零。
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that whatever it is, it's going to be delicious, because of the delicious aroma in the air.
不管他们做的是什么，肯定很美味，因为空气中漂浮着食物的诱人香味。
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So, if you want to attack urban air quality, this is probably moving in the wrong direction, OK?
所以如果你想攻击都市的空气质量，这可能是一个错误的方向，对吗？
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I'm hot, compared to the air of the room, or cold if I'm somewhere that's warm.
我相对于室内的空气是热的，或是冷的如果我呆在一个温暖的地方。
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As we climbed the air grew cooler and the Indian girls on the road wore shawls over their heads and shoulders.
在我们开车向山上爬行的过程中，空气开始,变得凉爽起来，路上的印第安姑娘都披着围巾。
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We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.
我们现在离夏天更近了,这样空气中不总是,充满额外的静电，所以这时做实验,会有一些挑战性。
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The horn obviously is a brass instrument and what makes the sound is a vibrating column of air.
显而易见的,圆号是个铜管乐器,它通过震动空气柱来发出声音
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He did it to bring more light, he did it to bring more air, he did it to free the flow for capital, money; that's why the department stores are on the boulevards.
他这么做是为了多点光,多点新鲜空气,他为了使资产的流动更为自由,这就是为什么百货商店都建在大道旁边
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But it can be acquired in the air, from patients that are from- from other individuals that are infected.
天花会通过空气传播,通过病人和其他感染者呼出的空气传播
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Helmets, roll bars, caution flags... I like the fresh air... and looking at the poor people in the infield.
头盔，保险杠，警示旗。,我喜欢新鲜空气。,还喜欢看场上的倒霉蛋们。
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Suppose there's a common resource out there, maybe it's a fish stock or maybe it's the atmosphere.
假如这里有一个可利用的公共资源,比如是个鱼群,或者是新鲜的空气
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I mean, you know the wings go, and the air runs, and then the motor on the engine and it's a miracle how it gets up there and that is the way I used to explain the Greeks, because I had no better idea.
我的意思是,你知道机翼的作用,空气的流动,还有引擎上的发动机,飞机能飞起来,是个奇迹,我就是用这种方式来解释希腊历史的,因为我也没有更好的方法了
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They were really gray and there's this heavy feeling in the air,
黑压压的一片，空气中有种厚重的感觉，
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The air is crisp and clean, unlike this room.
不像这屋子里，外面的空气新鲜又清静。
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But, as you know, air is only 20% oxygen, the balance being nitrogen.
但是你知道空气中只有20%的是氧气，大部分的是氮气。
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Volume of air in a part of a room.
一部分房间里空气的体积。
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Take four liters on this corner of the room.
在这房间的角落里取四升空气。
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So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.
不像水或者空气密度的,周期变化，我们这里,讨论的是电场。
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Now I didn't use--no hands-- that was just the notes that are naturally on the twelve and a half-foot length of vibrating air.
我没有用手控制,都是十二个半英尺高的震动空气柱,自然产生的音符
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That's the harmonic series that's on that, and what the valves do is they shorten and lengthen that vibrating column of air very much like the cello string on the fingerboard.
这就是圆号上的泛音列,活瓣的作用是增长或减短,空气柱的高度,很像大提琴指板上的弦
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I mean, if the energy is lower to occupy a smaller volume, then if I have this room and a bunch of molecules of oxygen, and nitrogen and what have you in the air, and there are weak attractions between them, why don't they all just sort of glum together and find whatever volume they like.
我的意思是，如果占据小的体积会使能量降低，如果我有这样一个空间,和一些氧气，氮气和其他空气中有的气体，并且分子之间还有微弱的相互作用，为什么他们不黏在一起,然后占据他们所想要占据的体积。
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So, in a sense, it says, you know, if you wanted to build a boat that took energy out of the warmth of the air to sail around the world, you can do that.
因此，某种意义上说，它宣称如果你想要造一艘船,通过从空气中获取热量,这是可以做到的。
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For those of you don't know what that is it's simply an instrument that counts radioactive particles in the air, and MIT now that you're at MIT, you'll all have a chance to see one first hand if you're ever in any of the labs, especially in the chemistry or bio labs.
不知道它是什么,它就是一个简单的,计算在空气中放射粒子数目的仪器,你们现在来了，如果你们在实验室里工作的话,尤其是化学和生物实验室，你们有很多机会亲手用到它。
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Our piston on the right side here fully out, and the piston on my right side, your left side, fully inside. There's no gas p1 on that side here. So there's p2 sitting here.
左边的这个活塞完全在外面，而右边的左边的这个活塞完全在里面，这边没有一点空气,这边是P2，这边是。
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You've just done an adiabatic compression of the ideal gas, you can pretend there is an ideal gas.
这就是对理想气体的,绝热压缩，---我们把空气近似作为理想气体处理。
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You're taking the air inside of the pump and you're compressing it. You're doing it so fast that there's not enough time for heat to come out of the gas that's inside the pump towards the walls of the pump.
你把空气吸进气筒里并且压缩它,你的动作很快以至于,没有足够的时间让热量,从气筒里面跑出来,传递到气筒壁上。
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The main goal of the respiratory system is to bring fresh in so that you can extract oxygen from it, and blow used air out so that you can rid of carbon dioxide which is the end product of carbon metabolism inside our bodies.
呼吸系统的主要功能是,吸入新鲜空气,以便获得空气中的氧气,呼出废气,以便排出二氧化碳,二氧化碳是人体内碳代谢的终产物
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