Vacuum should contain something in it. Because nothing is perfectly empty that's what I feel, but what is there left in it? Is there any matter or its just enegry. Can energy be pulled out of some space?
Answer
Vacuum is in fact not empty. According to our current understanding all of space is permeated by fields which due to quantum mechanical effects only tend around a zero energy value. This means that the vacuum is subject to fluctuations in the fields permeating it.
In essence particles pop into existence more or less randomly as a result of excitations in these fields making a vacuum a boiling sea.
The fluctuations are related to the Heisenberg uncertainty principle.
These fluctuations have been experimentally observed and are quite significant to modern physics. The Casimir effect describes the fluctuation in electromagnetic fields and has been observed in a lab environment.
An interesting article on quantum vacuum fluctuations can be found here: http://www.hep.caltech.edu/~phys199/lectures/lect5_6_cas.pdf
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