How empty can a Vacuum be?

Can a glass ever be truly empty? What changes in the absence of matter? Is it possible to reach absolute emptiness? All these answers in 7 minutes.

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Alessandro Roussel,
For more info: http://www.alessandroroussel.com/en

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To learn more :
https://en.wikipedia.org/wiki/Vacuum
https://en.wikipedia.org/wiki/Virtual_particle
https://en.wikipedia.org/wiki/Cosmological_constant_problem

Видео How empty can a Vacuum be? канала ScienceClic English