In which case the mutual repulsion of molecules will occur.

At distances comparable to the size of the molecules (atoms) themselves, attraction is more noticeable, and with further approach, repulsion. For example, a compressed body is straightened. This is due to the fact that during compression, the molecules are at such a distance from each other when repulsion begins to appear. For example, the compression of a spring, a foam rubber sponge, an eraser to erase a pencil.