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"Military folks move every two years generally, two to three years, and so that turnover and that constant influx of buying houses,buying cars, buying clothes for schools, is just a huge impact to the Enterprise community."
VOA: standard.2010.08.10
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That's a new constant for us in this course.
这是我们这课里,新的一个常数。
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Now for this experiment, this is a constant enthalpy experiment for the Joule-Thomson experiment, this is equal to zero.
对于这个实验，焦耳-汤姆逊实验,是一个焓不变的实验,焓变化等于0，所以我可以。
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Polls show public support for Mr.Obama's push for health-care reform has weakened in recent weeks, and the constant drumbeat of criticism at the town hall meetings has fed the perception that the political momentum for reform has slowed.
VOA: standard.2009.08.12
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It's this drive to constant self-definition that becomes the characteristic feature of Milton's work for later generations.
就是这种对自我界定的欲望,变成了弥尔顿留给后人的,作品的典型特征。
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Michael Jackson's death led many of Pakistan's local television channels Friday morning, knocking the near constant coverage of the military campaign against Taliban militants off the top of the news lineup, if only for a few hours.
VOA: standard.2009.06.26
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So, for example, if we're to hold the time constant, this makes it a lot simpler of an equation, because what we can end up doing is actually crossing out this whole term here.
比如说，如果我们把时间,定为常数，这使得方程,大大简化，因为我们可以把,这一项划掉。
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The material tells of God's provision for the people in the desert, but it also tells of the Israelites' constant complaining, and rebellion.
这些材料描述了上帝在沙漠中对人们的供应，同时也描述了犹太人不间断的抱怨和背叛。
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What you see is that the radius changes with atomic number for constant electron number.
对于等电子数的粒子，离子半径随着,原子数的变化而变化。
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The great discovery that Galileo and Newton made is that you don't need a force for a body to move at constant velocity.
伽利略和牛顿的伟大发现就是,物体不需要力来维持匀速运动
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And this second week of Harvard is fantastic and it was going to continue just that way, constant tide for the rest of your life.
在哈佛的第二周妙不可言,这种情况将持续下去，余生将是一浪高于一浪的快乐。
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In order for life to proceed, you need to maintain a constant internal environment.
为了维持生命,人体的内环境需要保持稳定
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Whereas under these conditions, these quantities, if you look at free energy change, for example at constant temperature and pressure, H you can still calculate H.
但是，在这些条件下，这些物理量，如果我们考察自由能的变化,例如在恒定的温度和压强下，我们仍然可以计算。
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And in particular let's look at, for example, du/dV du/dV at constant temperature.
更特殊一点考察，恒定温度下的。
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dw=0 Well for constant volume, dw is equal to zero.
约束是恒定体积，此时。
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And the relationship that he put forth is that the momentum is equal to Planck's constant times nu divided by the speed of light, or it's often more useful for us to think about it in terms of wavelength.
爱因斯坦提出的关系式是,动量等于普朗克常数,乘以υ除以光速，或者用波长来表示,通常更容易让我们想明白。
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So for an ideal gas then, dH/dp under 0 constant temperature, that has to be equal to zero.
所以对于理想气体,偏H偏p在恒温下，等于。
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There's our condition for equilibrium at constant temperature and pressure.
这就是我们在,恒定温度和压强下的平衡条件。
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This is how you get the rules for adding a vector to another vector, then taking a vector and multiplying it by some constant.
以上这些就是矢量加法的法则,以及数乘矢量的法则
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You're allowed Cv comes out here for this adiabatic expansion, which is not a constant volume only because this is always true for an ideal gas.
绝热过程写下,这个式子是因为它对理想气体都成立，并没有用到等容过程的条件,只用了理想气体的条件。
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You just change volume to pressure and basically you're looking at enthalpy under a constant -- anything that's done at a constant volume path with energy, there's the same thing happening under constant pressure path for enthalpy.
可以看到这就是把体积换成了压强,一般我们都是在一种恒定状态下,考虑焓的，任何在恒容条件下,能伴随能量变化的东西，也在恒压条件下伴随焓同样地变化,所以你可以经常。
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This is equal to zero. So this irreversible process this Joule-Thomson process, is a constant enthalpy process. Delta h for this process is equal to zero.
等于0。所以这个不可逆过程,也就是焦耳-汤姆逊过程,是一个等焓过程。
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For most problems on exams, those quantities are constant, independent of temperature.
然后对于考试中的大部分问题，这些量都是与温度无关的常数。
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First, free velocity, constant velocity can be obtained for free without doing anything.
首先,速度是无偿的,恒定速度不需外力作用就能无偿获得
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nRT So, dp/dT, for our ideal gas, at constant volume, remember pV is nRT.
对于理想气体状态方程pV等于，所以对理想气体。
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So this isn't the most useful form that we can have, but what we'll see shortly is that from this, we can then derive further criteria for essentially any set of variables or any set of external constraints, like constant temperature or pressure or volume and so forth that we might set.
所以这不是我们所能得到的最有用的形式，但是我们会很快看到，我们能够进一步推导出包含任意变量,或者任意约束的自发过程判断标准，比如说恒定的温度，压强,体积或者其他我们能够给出的约束。
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This is what's called the Bohr radius, and we'll explain - hopefully we'll get to it today where this Bohr radius name comes from, but for now what you need to know is just that it's a constant, just treat it like a constant, and it turns out to be equal to or about 1/2 an angstrom.
它叫做玻尔半径，我们后面会解释,希望我们今天可以讲到,波尔半径这个名称的由来，但现在你们只要记住,它是一个常数，只要把它当做一个常数对待，它等于,或者是1/2埃。
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H We also saw that dS for constant H and p was greater than zero.
我们同样可以看到如果保持自由焓,和压强不变熵的变化dS也是大于零的。
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The person who best captures the unconstrained view, Benjamin Constant, French philosopher and politician, " "It is for self-perfectioning that destiny calls us."
最好地阐述了本性受约束观点的人，法国哲学家政治家Benjamin，Constant说，“命运召唤我们进行自我完善“
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Adiabatic q equal to zero. It's also delta H 0 which is zero. The two didn't necessarily follow because remember, delta H is dq so p is only true for a reversible constant pressure process.
在这个过程中ΔH等于,绝热的所以q等于0，而ΔH也等于,这两个也不一定有因果关系,因为，记住，ΔH等于dq只有在恒压。
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