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Because the ceramic or glass disc rattles as the water boils alerting you that the water is boiling therefore you do not forget about it and it does not boil over.

Besides functioning as an audible alerter, the ceramic or glass disc will absorb excess heat in the pot. This is especially true when you are boiling something starchy such as rice or pasta. The layer of starch floats to the surface of the water and prevents the water from giving off it's excess heat. The ceramic or glass disc absorbs this extra heat and prevents the water from super-heating and boiling over.

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12y ago

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