boiling stones

what is the purpose of a boiling stone? why was corrundum (black) boiling stone recommended instead of a calcium carbonate (white marble) stone?
an irregularly shaped object is introduced into a heating element to allow smoother more predictable boiling. the irregular shaped object will provide more nucleation sites in the vessel to facilitate these small boiling areas for phase exchange. that is why an irregular stone is…

d over a smooth (white marble) stone. without these boiling chips or any other means to induce controlled boiling, violent outbursts of phase exchange can occur and can become rather dangerous

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