Is it possible to have particles fill a volume (such as a static mesh) and only that volume? I doubt it but just thought I would ask. 
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It should be possible to create a static mesh and have a particle system collide with that mesh, as so they cannot escape it (you'd likely need a physX liquid to achieve this). However, as far as I'm aware, it might not be possible to restrict collision to only that particle system, which may be an issue.
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