Joule-Thomsan effect

例句：

1. 1.The Joule-Thomson effect is a phenomenon where the temperature of a gas decreases as it expands.
   焦耳-汤姆森效应是一种现象，即气体在膨胀时温度会降低。
2. 2. This experiment demonstrates the Joule-Thomson effect by using a refrigerator to cool a liquid.
   通过使用冰箱冷却液体来演示焦耳-汤姆森效应的这个实验。
3. 3.In the Joule-Thomson effect, a gas expands when heated and contracts when cooled.
   在焦耳-汤姆森效应中，当加热时气体会膨胀，冷却时会收缩。