So that if, for example, i put two cubes of copper next to each other they don’t become one
In: 1
The copper exists in an environment with free atmospheric oxygen, which quickly forms a thin oxide layer at the surface, in addition to other trace amounts of contaminants that get in the way. Metals will spontaneously bond with each other if they’re extremely clean and kept in an vacuum.
https://en.wikipedia.org/wiki/Cold_welding
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