We know that atoms are mostly empty space, with a nucleus in the center and electrons orbiting around it. Given this, why can't we pass through solid objects, since there are gaps between the particles that make up matter?
What is the physical explanation for this resistance or "solidness" we experience? Is it due to electromagnetic forces, quantum mechanics, or another principle entirely?
I’m looking for a fundamental explanation — both in classical and quantum perspectives — of why macroscopic objects appear solid and impenetrable despite their atomic structure.
