Why don't most solids join together at normal temperatures? For example when you break a piece of metal you cannot join it together again unless you melt it at high temperatures, what stops it from joining together at its solid state?
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Answer:
it stops
because of the oxygen present between it
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When it is solid, it's particles are tightly packed and don't move but when they begin to melt at high temperature their particles gain kinetic energy from energy source and particles intermix and join together to make a single solid iron from its peices.
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