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Thermal Downshock

Thermal downshock is the name given to cracking resulting from rapid temperature change. It occurs when a thermal gradient causes different parts of an object to expand by different amounts. This differential expansion can be understood in terms of stress or of strain, equivalently. At some point, this stress overcomes the strength of the material, causing a crack to form. If nothing stops this crack from propagating through the material, it will cause the component to catastrophically fail.

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12y ago
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10y ago

This is a term called Thermal Shock. When something is hot, the molecules are rapidly vibrating and expanding. When cold, these same molecules contract. The result is that the molecules go "under shock" and they end up vibrating violently to release the energy that heated them up in the first place. The issue is that they release the energy so fast, that the alignment they were layed out as (aka glass) dislocates and therefore cracks or shatters the dish. It is best to just let the glass cool off for a bit when taking it out of the oven, or if you cannot wait for it to cool off, then use a metal dish instead because the flexibility allows for the material to not crack.

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Q: Why does a hot glass baking dish crack in the freezer?
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