
Does Nothingness Exist?
The Joy of Why
The Casimir Effect
There is some energy intrinsic to the vacuum of quantum theory. If we disturb that vacuum, that vacuum will respond in a way that its vacuum energy will also change. Hendrik Casimir proposed an experiment to measure a change in the vacuum energy. It was found that these conducting plates experience a pressure on them that is attractive. The magnitude of that pressure was actually found to be consistent with the calculation from the quantum theory.
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