"And we think the issue for black women is they are more likely to be obese and have chronic illnesses, like high blood pressure, which put you at higher risk for complications during pregnancy."
VOA: standard.2010.06.23
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。
Have you ever felt any pressure because of all of the intelligent people around you?
你周围的人都那么聪明,你会不会感到压力很大?
So the partial pressure or the pressure by which you have this triple point, happens to be 6.1 times 10 to the minus 3 bar.
而要小得多,事实上,水的三相点时的压强是6。1毫巴。
So expansion work, for instance, or compression work, is if you have a piston with a gas in it. All right, you put a pressure on this piston here, and you compress the gas down. This is compression work.
力乘以距离,就是功,功有许多种:,电可以做功,驱动电机与电风扇,磁力也可以做功。
Pressure is when you have one of these hard spheres colliding against the wall.
这是一个小球,它与墙发生碰撞。
The atoms or molecules in the gas don't know that there are other atoms and molecules in the gas, and then you end up with this universal property. All right, so gases that have this universal property, even when the pressure is not zero, those are the ideal gases.
可以忽略,这样就得到了理想气体的性质,在有限压强下,依然能保持这些性质的气体,被称为理想气体,本课中我们把大部分气体,都作为理想气体来处理。
You could have the volume and the pressure.
可以是体积和压强。
That is, in real life, the variables that you'd normally control aren't some combination of entropy and these variables, but really their temperature, volume and pressure, any couple of those, might be what you'd really have under experimental control.
在生活中,我们所能控制的,不是熵和其他变量的组合,而是温度,体积,压强,以及其中的两两组合,这些才是试验中所能控制的。
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