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Milk contains fat. When it reaches boiling temperature, the water at the top evaporates rapidly leaving behing a thin layer of fat. This fat seals the surface preventing water from evaporating. This water (steam) is collected under the film and forms a big bubble which enlarges as the milk continues to heat and pushes the surface to the top till it spills.

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15y ago
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Q: Why milk spills on boiling?
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