这是因为磁场降低了施加在内部气体上的压力,使得太阳黑子比太阳表面的其他部分温度更低。
That's because magnetic fields reduce the pressure exerted on the gases inside of them, making the spots cooler than the rest of the Sun's surface.
和施加在葡萄酒上的力的比率。
LBAC安全性不能施加在外部表数据文件上。
LBAC security cannot be imposed on external table data files.
So the force that you're pushing down on here is the external pressure times the area.
或者压缩功的概念,在活塞上施加压力。
That means the force you're applying is cancelled by another force, which has got to be the force of friction.
意味着你施加在物体上的力被另一个力抵消了,这个力就是摩擦力
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。
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