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The cover is lifted when the food is being boiled is due to the water evaporating and turning into gas. When water is evaporated into gas the gas requires more space than the water which increases pressure. This forces the container to open to increase the gases' available space.

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9y ago
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16y ago

Only a guess, but casseroles and covers are usually pyrex glass. Perhaps this precaution is meant to prevent the pyrex from chipping and getting into the food????

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Q: Why casserole cover gets lifted when the food being cooked is boiling?
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