[z2h-a6n]

To be somewhat pedantic: "touching" is a word. The extent to which it is or is not an "exact science" depends on what is meant by "touching", and by "exact science". The definition I gave of "touching" could be made arbitrarily more precise by specifying more precisely the interaction forces under consideration, and the level of precision to which one should compare their magnitudes. What you mean by "exact science" is something I cannot guess at with any useful level of precision. Whether or not any of this has any bearing on the original topic of discussion is another matter.

[amelius]

I mean, the actual interaction force that defines "touching" is open for debate. Touching is an abstract concept, removed from actual physics.

[z2h-a6n]

That was sort of my point. If we use a definition of "touching" that is relevant to the atomic scale, whatever that definition is, we can reasonably talk about what "touching" means at an atomic scale. If we use a colloquial definition of "touching" which is meaningful for macroscopic objects but not at the atomic scale, it doesn't make sense to talk about "touching" at the atomic scale.