Quantum Foam and Conservation of Energy

[Ghostcrown]

If quantum foam particles can exist long enough to interact with other close particles before returning to the vacuum, doesn't this introduce kinetic energy to a system that previously didn't have it before? Does this perhaps imply that a system (such as the universe) cannot actually be isolated or closed? Needless to say, I must be missing some crucial details here, and i'd much appreciate it if someone could fill me in on them. Thanks.

 

[Nugatory]

If you search the quantum mechanics forum here for threads containing "virtual particle", you will find a bunch of good discussion and explanation of this topic.