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Everything has holes in it. However, some things have holes small enough that almost nothing leaks through. Helium is used to detect leaks since it is the smallest atom (other than hydrogen that likes to form larger pairs). It is also easy to detect and non-reactive. Some materials are leak-tight unless they are heated up and the atoms and bonds start to move around.

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Q: Is everything porous or are there some things in this world that simply are not?
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