and the neutrons that make up the nucleus hold together, we know everything about the second force, coulombxact mathematical form, we only have nuclear models, that is, a model is, in any case , our idea of the object that we are studying , it can be better, it can be worse, these models can be very complex and very close to reality, but they still remain models, any model has limitations, from the point of view of nuclear theory, this is the building block that is missing for , so that nuclear science... well, after all, if without the equation formula, on at the level of metaphors, the core is, i don’t know, a snowball, a brick wall, a drop, some kind of lattice, what is it? well, there is such a model, yes, a liquid drop, yes, from the point of view of which the nucleus is a drop of very dense matter, a drop of such nuclear liquid, with rather sharply defined edges, in order to understand what density this formation is, then ... that is, they are so light, it turns out in this sense that the entire mass of the core and all the density is concentrated in a small core, everything else is