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These two relations involving entropy are also useful because they'll let us see how entropy depends on volume and pressure.
这两个涉及熵的关系也非常有用,因为他们告诉我们,熵和体积，压强的关系。
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Of course in the reversible case, you're always pushing against an external pressure, which is essentially equal to the internal pressure.
当然在可逆的情况下，外压力，总是，等于内部压力。
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And so the photons hitting the wall actually put pressure on the wall, but the pressure is so low.
所以光子碰撞墙面,事实上在对墙加压，但只是压力很小。
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More importantly, they can affect blood pressure as well, the strength of your heartbeat and the pressure that your heart generates.
尤为重要的是,这也会影响血压,心跳的强度,和心脏能够输出的压力
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Bush has come under mounting pressure from members of his own Party to shake up the White House Staff.
布什总统受到了,他党派内的巨大压力,让他更换白宫人员。
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There's naturally a lot of pressure on Milton to make this part of the simile beautiful and striking because he's echoing not just one epic poet, but essentially he's echoing just about every epic poet.
弥尔顿自然会感受到很多压力,必须得把这个比喻写的美丽动人,因为他不仅是在模仿一个诗人，实际上每个人史诗诗人都是他模仿共鸣的对象。
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You have a little more pressure in grad school, but sometimes that means when you're an undergrad your advisor will decide to put you on projects that maybe when you look at them seem a little bit silly.
那就是你们没有，要做出重大发现,或取得重大成就的压力,你们在研究生时候会有些压力,当然有时候这意味着。
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pV=RT dT here because the pressure is constant, dV=RdT/p so dV is equal to R over p dT.
因为对1摩尔气体有，于是。
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Let's imagine maybe instead we just immediately dropped the pressure let the system expand against the lower pressure.
现在假设,我们很快地降低压力,让系统在低的外压力下膨胀。
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So this unique temperature and unique pressure defines a triple point everywhere, and that's a great reference point.
这样，无论在何处,三相点都具有相同的温度和压强,十分适合来作参考点。
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Because it's so important. And I should add and also under reversible work, where the external pressure is equal to the internal pressure.
而且我还要说应该在外部压强,和内部压强相等的,可逆过程中引入它。
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In this case here, our property is the value of the pressure times the volume, times the molar volume. That's the property.
或者电阻,对气体来说，它的特性是气体压强。
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That is, most processes that we're concerned with, they'll happen with something held constant like pressure or temperature or maybe volume.
这句话是说我们所关注的大部分过程，发生的时候都是保持某个量为常数,比如压强，温度或者体积。
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Path number 2 on my diagram it's a reversible, this path number 2, it's a reversible constant pressure path.
路径，首先是一个，等压过程。
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We could just collect a bunch of data. For a material .What's the volume it occupies at some pressure and temperature?
对一种物质我们可以得到一系列测量数据,在给定的温度和气压下,它的体积是什么？
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The piston has a cross-sectional area, a, and the force pressure is force per volume area.
我们以活塞系统为例，来说明膨胀功。
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