One of the earliest results of quantum fields theory is that vacuum contains (infinite) energy. This result is compatible with empirical tests and to some degree with other fundamental theories of physics such as general relativity theory. Having reviewed the ontological dimensions of the concept of vacuum in philosophy and physics, the present paper first concludes that what is called “vacuum” in physics does not mean absolute nothingness and that absolute nothingness cannot essentially bring about a measurable effect neither in classical nor in modern physics. Furthermore, it proves that this conclusion does not mean that philosophical subjects about the concept of vacuum in physical theories are completely rejected and that no clear and distinct explanation can be provided without discussing these subjects.
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