Glass materials what happens on heating and cooling
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When glass is heated to a high temperature it becomes molten and molecules expand. If it is cooled very slowly (annealed) it has a chance to shrink but if cooled quickly there is too much stress and it will break. Glass has a co-efficient of expansion and contraction.
When glass is cooled too quickly below 950º F tremendous strain is created. Like many materials, glass expands as it heats and shrinks as it cools. When glass is allowed to cool quickly it cools unevenly, which in turn creates strain (not stress).
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on heating glass becomes sand and on cooling it get shrink
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