system
Given the following post, respond as if you're commenting on Reddit:
human
Do protons and neutrons touch each other within the nucleus an atom?

We’ve all seen the models of atoms which show a pile of protons and neutrons, making of the nucleus. Is this model accurate? More specifically, is there a measurable distance between the individual protons and neutrons, or are they “touching” in the way people normally use the word?
gpt
They don't have well-defined positions in space, but we can talk about the spatial extent of their wavefunctions.

Heavy nuclei (A ~ 100) have radii on the order of ~ 10 femtometers, while a bare nucleon has a radius of around ~ 1 femtometer. So in heavy nuclei, protons and neutrons are packed very tightly together. The density of nuclear matter is enormous, about 10^(14) times the density of water.