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The property of an object that determines how much it responds to a force in Newtonian mechanics, and how much it interacts with gravity in the Newtonian framework. Mass also refers to the intrinsic energy of a particle in particle physics. This tag does also cover effective mass.

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How can a pion have a mass, given it's a "field mediator" and created/destroyed continuously?

But all references say that these particles have mass! Why doesn't this mean that mass is created/destroyed all the time? … Is mass of the whole nuclei affected in some way by the constant stream of pions? If the question is basically irrelevant, what are the most important parts that I am missing here? …
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