The glass lid to our large stock pot just exploded - literally. Any theories as to how or why?

The glass lid to our large stock pot just exploded - literally. Any theories as to how or why?
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1 Answer

Answer :

My guess is repeated changes of temperature over a prolonged period of time: putting it in a cold place after use, and bringing it out of that cold place and putting it straight onto the stove. Each time you do that the glass will expand and contract too quickly causing micro-fractures that eventually weaken it until it does what just happened.
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