what happens to the size of metal object when it is cooled?
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Most solids expand when heated and contract when cooled. Water/ice is anomalous in that it expands when cooled, at least near its freezing point. If you've been unfortunate to forget a bottle of water in the freezer, only to find that it has broken once its contents have frozen, then you've seen this effect first-hand
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Hey mate here is your answer ⬇️
The metal is heated to a predefined temperature then cooled by air. The resulting metal is free of undesirable impurities and exhibits greater strength and hardness. Normalising is often used to produce a harder and stronger steel, albeit one that is less ductile than that produced by annealing.
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