Density of a subatomic particle

texasratt
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Can this be measured? ie - "What's the density of a proton?" If so, what exactly are we measuring?

If not, at what point does density as a concept break down?

Apologies if this needed to be under the "Classical" forum.
 
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No, OK for proton. Proton has a certain size, volume and mass, so the notion of its density is correct. Neutron stars are larger but have similar density.
 

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