Material solids maintain separation due to the balance of forces at the atomic level, where electrons repel each other, preventing them from occupying the same space. Gage blocks, made of steel, can be "rung" together because they are designed to fit closely without significant attraction or repulsion when not magnetized. Solids exist in a low-energy state, making them less reactive compared to gases, where electron interactions are more pronounced. The stability of solids is also influenced by the neutral charge of atoms, which allows for close packing without merging. Understanding these principles clarifies how solids interact and remain distinct from one another.