在自由空间放出的气体将无限膨胀。
A gas released in free space would expand indefinitely.
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气体的自由膨胀会使其温度降低。
Free expansion of a gas causes it to cool.
这些气体让阳光自由地进入大气层。
These gases allow sunlight to enter the atmosphere freely.
气体会将容器完全填充满，粒子可自由移动。
A gas completely fills its container. The particles are free to move about.
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