如果地面有团湿热未饱和空气，在某种外力作用下上升，上升高度越高，气压越低。因此，在上升过程中，这团空气的体积就要膨胀，在与外界没有发生热量交换，即绝热条件下，体积膨胀的结果必然导致气团温度下降。这种现象称为动力冷却。
事实上，这种冷却过程为地幔的缓慢流动提高了动力，驱使着板块运动，实现无止境地重塑地球表面。
It is in fact this cooling which powers the slow circulation of the mantle, and through that the endless remaking of the surface through plate tectonics.
Carrier后来把活塞动力改为离心式制冷机，可以冷却更大空间。
Carrier later switched from piston power to the centrifugal chiller, which allowed much larger Spaces to be cooled.
当你进行的时候，反应堆就会用全部的动力，运行，你排放出初冷却剂，那是热的，你开始注入紧急核心冷却水，那是冷的。
When you have an event, the reactor is operating at full power, you blowdown the primary coolant which is hot, you start injecting emergency core cooling water which is cold.
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