So that if, for example, i put two cubes of copper next to each other they don’t become one
In: 1
wow it seems that that Richard Feymann heard you and “wrote” an answer specifically for you, from wikipedia:
>The reason for this unexpected behavior is that when the atoms in contact are all of the same kind, there is no way for the atoms to “know” that they are in different pieces of copper. When there are other atoms, in the oxides and greases and more complicated thin surface layers of contaminants in between, the atoms “know” when they are not on the same part.
— Richard Feynman, The Feynman Lectures on Physics, 12–2 Friction
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